12th Standard Chemistry Question papers - study material, free online tests, previous year question papers, answer keys, topper answers, centum question paper, exam tips

12th Standard Chemistry English Medium - Important 5 Mark Question Paper and Answer Key 2022 - 2023 - by Study Materials - Dec 31, 2022 - View & Read

1)
Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K
2)
Give the limitations of Ellingham diagram.
3)
Give the balanced equation for the reaction between chlorine with cold NaOH and hot NaOH.
4)
Write the postulates of Werner’s theory.
5)
On the basis of VB theory explain the nature of bonding in [Co(C₂O₄)₃]^3-

12th Standard Chemistry English Medium - Important 3 Mark Question Paper and Answer Key 2022 - 2023 - by Study Materials - Dec 31, 2022 - View & Read

1)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag
2)
A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.
3)
Write the reason for the anomalous behaviour of Nitrogen.
4)
Explain why Cr²⁺ is strongly reducing while Mn³⁺ is strongly oxidizing.
5)
Why do zirconium and Hafnium exhibit similar properties?

12th Standard Chemistry English Medium - Important 2 Mark Question Paper and Answer Key 2022 - 2023 - by Study Materials - Dec 31, 2022 - View & Read

1)
Give the uses of zinc.
2)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
3)
Complete the following reactions.
a. \(B(OH)_3 + NH_3\longrightarrow \)
b. \(Na_{ 2 }B_{ 4 }{ O }_{ 7 }+{ { H }_{ 2 }{ SO }_{ 4 }+{ 5H }_{ 2 }O\longrightarrow }\)
c. \({ B }_{ 2 }{ H }_{ 6 }+2NaOH+2{ H }_{ 2 }O\longrightarrow \)
d. \({ B }_{ 2 }{ H }_{ 6 }+6{ CH }_{ 3 }OH\longrightarrow \)
e. \(4{ BF }_{ 3 }+3{ H }_{ 2 }O\longrightarrow \)
f. \(HCOOH+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow \)
g. \(2SiCl_{ 4 }+NH\)₃
h. SiCl₄ + 4C₂H₅OH \(\rightarrow\)
i. 2\(B+6NaOH\longrightarrow \)
j. \({ H }_{ 2 }{ B }_{ 4 }{ O }_{ 7 }\overset { Red\ hot }{ \rightarrow } \)
4)
Give the uses of argon.
5)
What are interstitial compounds?

12th Standard Chemistry English Medium - Important 1 Mark MCQ's Question Paper and Answer Key 2022 - 2023 - by Study Materials - Dec 31, 2022 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
Zinc is obtained from ZnO by________.
3)
Which of the following is not true with respect to Ellingham diagram?
4)
In diborane, the number of electrons that accounts for banana bonds is ________.
5)
The repeating unit in silicone is_______.

12th Standard Chemistry English Medium - Revision Model Question Paper with Answer Key 2022 - 2023 - by Study Materials - Dec 31, 2022 - View & Read

1)
Bauxite has the composition ______.
2)
An aqueous solution of borax is________.
3)
Which is true regarding nitrogen?
4)
Which one of the following ions has the same number of unpaired electrons as present in V³⁺?
5)
Oxidation state of Iron and the charge on the ligand NO in [Fe(H₂O)₅NO]SO₄ are_______.

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Differentiate thermoplastic and thermosetting.
2)
Write a note on drug target interaction.
3)
Explain Receptor as drug targets.
4)
Explain the classification of polymers based on their structure and mode of synthesis.
5)
Styrene polymerises to polystyrene when heated in the presence of peroxide initiator.
(i) What is the mechanism involved?
(ii) Give the initiation step for the above process.
(iii) How does the chain propogate in the above mechanism?
(iv) How is the above chain reaction terminated?

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What are bio degradable polymers? Give examples.
2)
How is terylene prepared?

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Who do soaps not work in hard water?
2)
Name some important categories of food additives.
3)
Give some of the advantages of using food additives.
4)
Write a short note on Antioxidants.
5)
How is Low density polyethene prepared?

12th Standard Chemistry English Medium Chemistry - Chemistry In Everyday Life Biomolecules 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What are drugs? How are they classified.
2)
What are narcotic and non – narcotic drugs. Give examples
3)
What are anti fertility drugs? Give examples.
4)
Write a note on co –polymer
5)
Write a note on vulcanization of rubber

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which chemical is responsible for the antiseptic properties of dettol.
2)
What are competitive inhibitors?
3)
What are allosteric inhibitors?
4)
Explain the term target drug action used in medicinal chemistry?
5)
Give an example of a macromolecule chosen as drug targets.

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What are antibiotics?
2)
Name one substance which can act as both analgesic and antipyretic.
3)
Write a note on synthetic detergents
4)
How do antiseptics differ from disinfectants?
5)
What are food preservatives?

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Dettol is the mixture of _____________.
2)
Saccharin, an artificial sweetener is manufactured from ____________.
3)
Which is the monomer of neoprene in the following?
4)
An example of anti-fertility drug is ____________.
5)
The drug used to induce sleep is _______________.

12th Standard Chemistry English Medium - Chemistry In Everyday Life Biomolecules 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which of the following is an analgesic?
2)
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.
3)
Drugs that bind to the receptor site and inhibit its natural function are called _______.
4)
Aspirin is a/an _______.
5)
Which one of the following structures represents nylon 6,6 polymer?

12th Standard Chemistry English Medium - Biomolecules 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give the uses of carbohydrates.
2)
Elucidate the structure of glucose.
3)
Elucidate the structure of fructose.
4)
Define the following terms as related to proteins
(i) Primary structure
(ii) Secondary structure
(iii) β strands
5)
List the importance of proteins in biological processes.

12th Standard Chemistry English Medium - Biomolecules 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Explain the reaction which indicates the presence of ketonic group in fructose.
2)
What are amino add? Explain essential and non-essential amino acids.
3)
Write the product formed when HCN reacts with glucose.
4)
Write a reaction that indicates the presence of an aldehyde group in glucose.
5)
Complete the following reaction.
(i) Glucose + acetic anhydride ➝ _______?_______
(ii) What does the above reaction suggest?

12th Standard Chemistry English Medium - Biomolecules 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give the differences between primary and secondary structure of proteins.
2)
Give any three difference between DNA and RNA.
3)
Write a short note on peptide bond.
4)
What are reducing and non – reducing sugars?

12th Standard Chemistry English Medium - Biomolecules 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
List the expected products of hydrolysis of lactose.
2)
\({ 6CO }_{ 2 }+{ 6H }_{ 2 }O\overset { Sunlight }{ \longrightarrow } { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+{ 6O }_{ 2 }\)
Name the above process.
3)
Identify whether the following compounds are D or L isomers.
4)
A sugar contains 4 carbon atoms and the functional group is -CHO group. Identify the type of sugar and give an example for it.
5)
What is epimerisation?

12th Standard Chemistry English Medium - Biomolecules 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What type of linkages hold together monomers of DNA?
2)
Name the Vitamins whose deficiency cause i) rickets ii) scurvy
3)
Write the Zwitter ion structure of alanine
4)
Give two difference between Hormones and vitamins.
5)
Write a note on denaturation of proteins.

12th Standard Chemistry English Medium - Biomolecules 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which among the following is called fruit sugar?
2)
Disaccharides have general formula
3)
Name the base present only in RNA
4)
Which is a monosaccharide among the following?
5)
Identify the reducing sugar.

12th Standard Chemistry English Medium - Biomolecules 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which one of the following rotates the plane polarized light towards left?
2)
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
3)
Which one given below is a non-reducing sugar?
4)
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
5)
The central dogma of molecular genetics states that the genetic information flows from______.

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Write a note on the reduction of nitro benzene under different conditions.
2)
Draw a flow chart to show classification of nitro compound giving examples for each type.
3)
Account for the following:
i) (CH₃)₂ NH is stronger base than NH₃
ii) CH₃CH₂NH₂ is more basic than CH₃CONH₂
iii) Aniline is less basic than Ethyl amine
iv) On sulphonation of aniline, p-amino benzene sulphonic acid is formed.
4)
What happens when ethylamine is treated with
(i) CHCl₃/NaOH
(ii) CS₂
(iii) C₆H₅CHO.
5)
Account for
i) Reduction of CH₃CH gives CH₃CH₂NH₂while CH₃NC gives (CH₃)₂NH.
ii) (CH₃)₂NH requires two molar proportion of CH₃I to give the same crystalline product formed by (CH₃)₂N with one mole of CH₃l.
iii) Nitration of aniline with conc.HNO₃ may end up with same meta nitro product.
iv) p-toluidine is a stronger base than p-nitroaniline.

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
How will you distinguish between primary secondary and tertiary alphatic amines.
2)
Predict A,B,C and D for the following reaction
3)
A dibromo derivative (A) on treatment with KCN followed by acid hydrolysis and heating gives a monobasic acid (B) along with liberation of CO₂ . (B) on heating with liquid ammonia followed by treating with Br₂ /KOH gives (c) which on treating with NaNO₂ and HCl at low temperature followed by oxidation gives a monobasic acid (D) having molecular mass 74. Identify A to D.
4)
Identify A to E in the following sequence of reactions

\(\overset { {CH_3} {CL} }{ \underset { {AlCl}_3 }{ \longrightarrow } }\) A \(\overset { {HNO_3}/ {H_2So_4} }{ \underset { {} }{ \longrightarrow } }\) B \(\overset { {Sn} /{HCL} }{ \underset {{} }{ \longrightarrow } }\) (C) \(\overset { {NaNo_2}/ {HCL} }{ \underset { {O^o}C }{ \longrightarrow } }\) D \(\overset { {CuCN} }{ \underset { {}}{ \longrightarrow } }\) E

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Write a note on acidic nature of nitro alkanes.
2)
How are nitro alkanes prepared for the following
i) alkyl bromides
ii) methane
3)
How will convert nitrobenzene to benzoic acid?
4)
Write a note on the basicity of amines.
5)
An Organic compound (A) with molecular formula C₆H₇N gives (B) with HNO₂ / HCI at 273 K. The aqueous solution of (B) on heating gives compound (C) which gives violet colour with netural FeCI₃. Identify the compounds (A), (B) and (C) and write the equations.

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Identify compounds A, B and C in the following sequence of reactions.
i) \({ C }_{ 6 }{ H }_{ 5 }NO_{ 2 }\overset { Fe/HCL }{ \longrightarrow } A\overset { HN{ O }_{ 2 } }{ \underset { 273K }{ \longrightarrow } } B\overset { { C }_{ 6 }{ H }_{ 5 }OH }{ \longrightarrow } C\)
ii) \({ C }_{ 6 }{ H }_{ 5 }N_{ 2 }cl\overset { CuCN }{ \longrightarrow } A\overset { H_{ 2 }O/H^{ + } }{ \longrightarrow } B\overset { NH_3 }{ \longrightarrow } C\)
iii) \({ C }{ H }_{ 3 }{ C }{ H }_{ 2 }I\overset { NaCN}{ \longrightarrow } A\overset {OH^-}{ \underset {Partial hydrolysis}{ \longrightarrow } } B\overset {NaOH+Br_2 }{ \longrightarrow } C\)
iv) \({ C }{ H }_{ 3 }NH_{ 2 }\overset { CH_3 Br }{ \longrightarrow } A\overset { CH_{ 3 }COCl}{ \longrightarrow } B\overset { B_2H_6 }{ \longrightarrow } C\)
v) \({ C }_{ 6 }{ H }_{ 5 }NH_{ 2 }\overset { (CH_{ 3 }CO)_{ 2 }O }{ \underset { Pyridine }{ \longrightarrow } } A\overset { HNO_{ 3 } }{ \underset { H_{ 2 }SO_{ 4 },288K }{ \longrightarrow } } B\overset { { H }_{ 2 }O/{ H }^{ + } }{ \longrightarrow C } \)
vi)

vii) \({ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i) NaN{ O }_{ 2 }/HCL }{ \underset { ii){ H }_{ 2 }O }{ \longrightarrow } } \)
2)
Write short notes on the following
i. Hofmann’s bromide reaction
ii. Ammonolysis
iii. Gabriel phthalimide synthesis
iv. Schotten – Baumann reaction
v. Carbylamine reaction
vi. Mustard oil reaction
vii. Coupling reaction
viii. Diazotisation
ix. Gomberg reaction
3)
Account for the following
i. Aniline does not undergo Friedel – Crafts reaction
ii. Diazonium salts of aromatic amines are more stable than those of aliphatic amines
iii. pK_b of aniline is more than that of methylamine
iv. Gabriel phthalimide synthesis is preferred for synthesising primary amines.
v. Ethylamine is soluble in water whereas aniline is not
vi. Amines are more basic than amides
vii.Although amino group is o – and p – directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m – nitroaniline.
4)
How will you convert diethylamine into
i) N, N – diethylacetamide
ii) N – nitrosodiethylamine
5)
Identify A,B and C
\(\overset{SOCl_2}\longrightarrow A \overset{NH_3}\longrightarrow B\overset{LiAlH_4}\longrightarrow (C)\)

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give the IUPAC name of the following compounds.
i)
ii)
2)
Define tautomerism.
3)
Which among the following nitro compound will not exhibit tautomerism and why?
i) \(\underset { nitro \ ethane }{ { CH }_{ 3 }{ CH }_{ 2 }{ NO }_{ 2 } } \)
ii) \(\underset { 2-nitropropane }{ { (CH }_{ 3 })_{ 2 }CH-{ NO }_{ 2 } } \)
iii) \({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ NO }_{ 2 }\)
2 - methyl- 2 - nitropropane
4)
Explain the conversion of benzene to nitrobenzene.
5)
Two isomers having the molecular formula C₂H₅NO₂ on hydrolysis in acidic medium gives (A) and (B). Identify (A) and (B) and explain the reactions involved.

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Write down the possible isomers of the C₄H₉NO₂ give their IUPAC names.
2)
There are two isomers with the formula CH₃NO₂. How will you distinguish between them?
3)
What happens when
i. 2 – Nitropropane boiled with HCl
ii. Nitrobenezene undergo electrolytic reduction in strongly acidic medium.
iii. Oxidation of tert – butylamine with KMnO₄
iv. Oxidation of acetoneoxime with trifluoroperoxy acetic acid
4)
How will you convert nitrobenzene into
i. 1,3,5 - trinitrobenzene
ii. o and p- nitrophenol
iii. m – nitro aniline
iv. azoxybenzene
v. hydrozobenzene
vi. N – phenylhydroxylamine
vii. aniline
5)
Complete the following reaction

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)

The above structure represents
2)
Nitration of nitrobenzene results in
3)
Which among the following reactions will give a secondary amine?
4)
Identify product 'Y' in the following reaction
5)
Electrolytic reduction of nitrobenzene in strongly acidic medium gives

12th Standard Chemistry English Medium - Organic Nitrogen Compounds 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which of the following reagent can be used to convert nitrobenzene to aniline.
2)
The method by which aniline cannot be prepared is _________.
3)
Which one of the following will not undergo Hofmann bromamide reaction.
4)
CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\) D' is________.
5)
Which one of the following nitro compounds does not react with nitrous acid.

12th Standard Chemistry English Medium - Carbonyl Compounds 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
How does formaldehyde react with
(I) NH₃
(ii) CH₃Mg₁ followed by hydrolysis and
(iii) NaOH
2)
Illustrate the reducing property of acetaldehyde with examples
3)
Discuss the mechanism of aldol condensation.
4)
Which compounds on Clemmenson reduction give
(i) 2-methyl propane
(ii) ethyl benzene
(iii) propane
(iv) diphenyl methane.
5)
Draw resonance structures for the following
(i) CH₃COO^-
(ii)CH₃CONH₂
(iii) C₆H_sCHO
(iv) C₆H₅COO^-

12th Standard Chemistry English Medium - Carbonyl Compounds 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
A Compound (A) with molecular formula C₂H₃N on acid hydrolysis gives (B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl₃ to give compound(D). Compound (D) on reduction with Zn/Hg and Conc.HCl gives (E). Identify (A), (B), (C) (D) and (E). Write the equations.
2)
Identify A, B, C and D
\(\text { ethanoic acid } \stackrel{\mathrm{SOCl}_{2}}{\longrightarrow} \mathrm{A} \stackrel{\mathrm{Pd} / \mathrm{BaSO}_{4}}{\longrightarrow} \mathrm{B} \stackrel{\mathrm{NaOH}}{\longrightarrow} \mathrm{C} \stackrel {\longrightarrow}{\triangle} \mathrm{D}\)
3)
An alkene (A) on ozonolysis gives propanone and aldehyde (B). When (B) is oxidised (C) is obtained. (C) is treated with Br₂/P gives (D) which on hydrolysis gives (E). When propanone is treated with HCN followed by hydrolysis gives (E). Identify A, B, C, D and E.

12th Standard Chemistry English Medium - Carbonyl Compounds 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
How is acetaldehyde prepared by the ozonolysis of CH₃CH=CHCH₃?
2)
Explain Stephen's reaction.
3)
What is Rosenmund's reduction? What is the purpose of adding BaSO₄ in it?
4)
Formaldehyde and benzaldehyde give Cannizaro reaction but acetaldehyde does not - account for this.
5)
Explain the isomerism exhibited by carboxylic acids.

12th Standard Chemistry English Medium - Carbonyl Compounds 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Identify A, B and C
2)
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
3)
How are the following conversions effected
(a) propanal into butanone
(b) Hex-3-yne into hexan-3-one.
(c) phenylmethanal into benzoic acid
(d) phenylmethanal into benzoin
4)
Complete the following reaction
\({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { HO-{ CH }_{ 2 }-{ CH }_{ 2 }-OH }{ \underset { { dry }{ HCl} }{ \longrightarrow } } ?\)
5)
Identify A, B and C

12th Standard Chemistry English Medium - Carbonyl Compounds 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
A hydrocarbon A (molecular formula C₈H₁₀) on ozonolysis gives B (C₄H₆O₂) only. Compound C (C₃H₅Br) on treatment with magnesium in dry ether gives (D) which on treatment with CO₂followed by acidification gives(C). Identify A, B and C.
2)
State the laws of reflection.
3)
What is angle of deviation due to reflection?
4)
Give the characteristics of image formed by a plane mirror.
5)
Derive the relation between f and R for a spherical mirror.

12th Standard Chemistry English Medium - Carbonyl Compounds 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
How is propanoic acid is prepared starting from
(a) an alcohol
(b) an alkylhalide
(c) an alkene
2)
Identify X and Y.
\({ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MgBr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y\)
3)
How will you convert benzaldehyde into the following compounds?
(i) benzophenone
(ii) benzoic acid
(iii) α-hydroxyphenylaceticacid.
4)
What is the action of HCN on
(i) propanone
(ii) 2,4-dichlorobenzaldehyde
iii) ethanal
5)
A carbonyl compound A having molecular formula C₅H₁₀O forms crystalline precipitate with sodium bisulphate and gives positive iodoform test. A does not reduce Fehling solution. Identify A.

12th Standard Chemistry English Medium - Carbonyl Compounds 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
2)
Give the common and IUPAC name of the compound HO-CH₂-\(\underset { \overset { | }{ OH } }{ CH } \)-CHO
3)
Cannizaro reaction is not given by _______.
4)
Which among the following on oxidation with alk.KMnO₄ will give butanone?
5)
The IUPAC name of the compound

12th Standard Chemistry English Medium - Carbonyl Compounds 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
The correct structure of the product ‘A’ formed in the reaction ______.
2)
The formation of cyanohydrin from acetone is an example of _______.
3)
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.
4)
In the following reaction, \(HC\equiv CH \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give _______.
5)
\({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is _______.

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
An organic compound (A) of molecular formula C₃H₈O gives turbidity within 5-10 min on reaction with anhydrous ZnCI₂/HCI.Compound (A) on treatment with sodium hypochlorite gives a carbonyl compound (B) which on further chlorination gives compound (C) of molecular formula C₃H₃OCl₃. Identify (A), (B) and (C). Explain the reactions.
2)
An organic compound (A) C₂H₆O liberates hydrogen on treatment with metallic sodium. (A) on mild oxidation gives (B) C₂H₄O which answers iodoform test. (B) when treated with cone. H₂SO₄undergoes polymerisation to give (C) a cyclic compound. Identify (A) (B) and (C) and explain the reactions.
3)
An organic compound A of molecular f formula C₆H₆O gives violet colouration with neutral FeCl₃. Compound A on treatment with metallic Na gives compound B. Compound B on treatment with CO₂ at 400 K under pressure gives C. This product on acidification gives compound D (C₇H₆O₃) which is used in medicine. Identify (A) (B) (C) and D and explain the reactions.
4)
An organic compound A of molecular formula C₃H₆O on reduction with LiAlH₄ gives B. Compound B gives blue colour in Victor Meyer's test and also forms a chloride C with SOCl₂. The chloride on treatment with alcoholic KOH gives D. Identify A, B, C and D and explain the reactions.
5)
Ail organic compound (A) C₃H₈O answers Lucas test within 5-10 minutes and on oxidation forms B (C₃H₆O). This on further oxidation forms C(C₂H₄O₂) which gives effervescence with Na₂ CO₃Balso undergoes iodoform reaction. Identify A, B and C. Explain the conversion of A to B and C.

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Predict the product A,B,X and Y in the following sequence of reaction
2)

Identify A,B,C,D and write the complete equation
3)
3,3 – dimethylbutan -2-ol on treatment with conc. H₂SO₄to give tetramethyl ethylene as a major product. Suggest a suitable mechanism.

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
When phenol on treatement with Br₂/H₂O readily gives a precipitate of 2, 4, 6 - tribomo phenol.
2)
Explain Swern oxidation of propan-2-ol to propanane.
3)
Explain the manufacture of glycerol from triglycerides,
4)
Write a note on Friedel Crafts reaction of anisole.
5)
Complete the following sequence of reaction and Identify A, B and C.

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction.
2)
Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI.
3)
Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.
4)
What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.
5)
Predict the major product, when 2-methyl but -2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration
(ii) Hydroboration
(iii) Hydroxylation using Baeyer's reagent

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give reasons: Methanol is miscible with water while iodo-methane is not.
2)
Compare the acid strength in 1⁰, 2⁰ and 3⁰ alcohol giving reason.
3)
How will you convert C₂H₅OH to C₂H₅OC₂H₅?
4)
Complete the reaction and write the names of products. C₂H₅OH + NH₃ \(\overset { { Al }_{ 2 }{ O }_{ 3 } }{ \underset { { 360 }^{ 0 }C }{ \longrightarrow } } \)?
5)
Explain 'esterification' reaction with an example.

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Write the structure of the aldehyde, carboxylic acid and ester that yield 4- methylpent -2-en-1-ol.
2)
What is metamerism? Give the structure and IUPAC name of metamers of 2-methoxy propane
3)
Complete the following reactions

ii) \(C_6H_5-CH_{2}CH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow\)
4)
How are the following conversions effected
i) benzylchloride to benzylalcohol
ii) benzyalalcohol to benzoic acid
5)
Complete the following reactions
i) CH_3- CH₂ - OH \(\overset { { P}{ Br_3 }{ } }{ \underset { {} }{ \longrightarrow } }\) A \(\overset { { aq.NaOH}{ }{ } }{ \underset { {} }{ \longrightarrow } }\) B \(\overset { { Na}{ } }{ \underset { {} }{ \longrightarrow } }\) C
ii) C₆H₅- OH \(\overset { { Zn \ dust}{ } }{ \underset { {} }{ \longrightarrow } }\) A \(\overset { { CH_3}{Cl}{ } }{ \underset { {Anhydrs}{AlCl_3} }{ \longrightarrow } }\) B \(\overset { { acid}{K MnO_4}{ } }{ \underset { {} }{ \longrightarrow } }\) C

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which among the following alkene on acid hydration will produce tertiary butyl alcohol?
2)
Pick out the odd one among the following.
3)
Which one of the alcohol cannot be prepared by grignard reagent?
4)
Which among the following statement are correct with regard to alkyl halides?
5)
Which among the following reagent is not used to differentiate ethanol and phenol?

12th Standard Chemistry English Medium - Hydroxy Compounds and Ethers 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
2)
Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.
3)
The X is _______.
4)
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
5)
Which one of the following is the strongest acid.

12th Standard Chemistry English Medium - Surface Chemistry 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Write the characteristics of adsorption.
2)
Explain the factors affecting adsorption.
3)
Write a note on Freundlich adsorption isotherm.
4)
Write the characteristics of catalysts.
5)
Give the special characteristics of enzyme catalysed reactions.

12th Standard Chemistry English Medium - Surface Chemistry 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Explain intermediate compound formation theory of catalysis with an example.
2)
What is the difference between homogenous and hetrogenous catalysis?
3)
Describe adsorption theory of catalysis

12th Standard Chemistry English Medium - Surface Chemistry 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give any three application of adsorption.
2)
Write a note.
(i) Positive catalyst
(ii) Negative catalyst
3)
Write a note on auto catalysis?
4)
What are active centres?
5)
What are the important concepts of catalysis that adsorption theory explains?

12th Standard Chemistry English Medium - Surface Chemistry 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Differentiate physisorption and chemisorption.
2)
What is the difference between a sol and a gel?
3)
What are the factors which influence the adsorption of a gas on a solid?
4)
Give three uses of emulsions.
5)
Write a note on electro osmosis.

12th Standard Chemistry English Medium - Surface Chemistry 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
In a coagulation experiment 10 mL of a colloid (X) is mixed with distilled water and 0.1M solution of an electrolyte AB so that the volume is 20 mL. It was found that all solutions containing more than 6.6 mL of AB coagulate with in 5 minutes. What is the flocculation values of AB for sol (X)?
2)
What is an interface?
3)
What do you mean by positive and negative adsorption?
4)
Define adsorption isobar.
5)
Define adsorption isotherm.

12th Standard Chemistry English Medium - Surface Chemistry 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give two important characteristics of physisorption.
2)
In case of chemisorption, why adsorption first increases and then decreases with temperature?
3)
Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂?
4)
Heat of adsorption is greater for chemisorptions than physisorption. Why?
5)
Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

12th Standard Chemistry English Medium - Surface Chemistry 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.
2)
Which among the following does not affect adsorption?
3)
According to Freundlich adsorption isotherm,_______.
4)
Which of the following is true regarding Freundlich adsorption isotherm equation?
5)
Pick the odd one out.

12th Standard Chemistry English Medium - Surface Chemistry 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which of the following is incorrect for physisorption?
3)
Which one of the following characteristics are associated with adsorption?
4)
Fog is colloidal solution of _______.
5)
Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

12th Standard Chemistry English Medium - Electro Chemistry 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What is the electrochemical equivalent of a substance when 150 gm of it is deposited by 10 ampere of current passed for 1 sec?
2)
The electrochemical equivalent of an electrolyte is 2.35 gm amp^-1 sec^-1. Calculate I the amount of the substance deposited when 5 ampere is passed for 10 sec.
3)
To 1M solution of AgNO₃, 0.75 F quantity of current is passed. What is the concentration of the electrolyte, AgNO₃ remaining in the solution?
4)
0.5 F of electric current was passed through 5 molar solution of AgNO₃, CuSO₄ and AICl₃ connected in series. Find out the concentration of each of the electrolyte after the electrolysis.
5)
To one molar solution of a trivalent metal salt, electrolysis was carried out and 0.667 M was the concentration remaining after electrolysis. Calculate the quantity of electricity passed.

12th Standard Chemistry English Medium - Electro Chemistry 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.
2)
Derive an expression for Nernst equation.

12th Standard Chemistry English Medium - Electro Chemistry 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Answer the following question with regard to specific resistance.
(i) How is specific resistance represented?
(ii) What does specific resistance depend on?
(iii) What is the reciprocal of specific resistance? How is it denoted.
(iv) What is the unit of resitivity?
2)
Define molar conductance.
3)
Define equivalent conductance.
4)
0.1 M solution of two electrolytes P and Q have specific conductance 4 x 10^-4 S cm^-1 and 6 x 10^-6 S cm^-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.
5)
What is the oxidation and reduction half cell in a Daniel cell?

12th Standard Chemistry English Medium - Electro Chemistry 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
State Faraday’s Laws of electrolysis
2)
Describe the construction of Daniel cell. Write the cell reaction.
3)
Why is anode in galvanic cell considered to be negative and cathode positive electrode?
4)
The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5\(\times\)10^-4 S cm⁻¹.
i) molar conductivity of the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
\(\lambda^{0}_{cation}=248.2 \ S\) cm² mol^-1
\(\lambda^{0}_{anlon}=51.8 \ S\) cm² mol^-1
5)
Which of 0.1M HCl and 0.1 M KCl do you expect to have greater \(\stackrel{0}{\Lambda}_{\mathrm{m}}\)and why?

12th Standard Chemistry English Medium - Electro Chemistry 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give the mathematical expression of ohm's law.
2)
Define resistance. Give its mathematical expression
3)
Define resistivity
4)
Two electrodes having cross sectional area of l A and are separated by a distance l. What is the ratio of length by area called?
5)
Define conductance. Give its unit

12th Standard Chemistry English Medium - Electro Chemistry 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Define anode and cathode
2)
Why does conductivity of a solution decrease on dilution of the solution.
3)
Describe the electrolysis of molten NaCl using inert electrodes
4)
Explain the function of H₂ - O₂ fuel cell.
5)
A solution of silver nitrate is electrolysed for 20 minutes with a current of 2 amperes. Calculate the mass of silver deposited at the cathode.

12th Standard Chemistry English Medium - Electro Chemistry 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Which one of the following solution has highest equivalent conductance?
2)
Pick out the correct statement regarding resistance of an electrolytic solution ________.
3)
Which among the following is the strongest reducing agent?
4)
Which of the statements about electrolytic conductance is not true?
5)
A device in which spontaneous chemical reaction generates electric current ________.

12th Standard Chemistry English Medium - Electro Chemistry 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
Consider the following half cell reactions.
Mn²⁺ + 2e^- ➝ Mn E^o = -1.18V
Mn²⁺ ➝ Mn³⁺ + e^- E^o = -1.51V
The E^o for the reaction 3Mn²⁺➝ Mn + 2Mn³⁺, and the possibility of the forward reaction are respectively.
3)
The button cell used is watches function as follows
Zn (s) + Ag₂O (s) + H₂O (l) ⇌ 2Ag (s) + Zn²⁺ (aq) + 2OH^-(aq) the half cell potentials are Ag₂O (s) + H₂O (l) + 2e^- → 2Ag (s) + 2OH^- (aq) E^o= 34V and Zn (s) → Zn²⁺ (aq) + 2e⁻ E⁰ = 0.76V . The cell potential will be_______.
4)
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 ×10⁻³ S cm⁻¹at 298 K is______.
5)

Electrolyte KCl KNO₃ HCl NaOAC NaCl

Λ_-
(Scm² mol^-1) 149.9 145.0 426.2 91.0 126.5

Calculate Λ^o_HoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25^oC_______.

12th Standard Chemistry English Medium - Ionic Equilibrium 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
The hydrogen ion concentration of a fruit juice is 3.3 x 10^-2 M. What is the pH of the juice? Is it acidic or basic?
2)
Calculate the pH of a buffer containing 0.08 mole of acetic acid and 0.12 mole of sodium acetate per dm, of the solution. The ionisation constant of acetic acid is 1.8 x 10^-5.
3)
Calculate the pH of 0.1 M acetic acid if its ionisation constant Ka = 1.8 x 10^-5.
4)
pH of a solution is 5.5 at 25°C. Calculate its [OH^-].
5)
Calculate the pH of solution with HO⁺ concentrations in mol dm^-3.
(i) 10^-4
(ii) 10^-7
(iii) 6.8 x 10^-3
(iv) 3.2 x 10^-5
(v) 0.035
(vi) 0.25
(vii) 5.4 x 10^-9
(viii) 7.1 x 10^-7

12th Standard Chemistry English Medium - Ionic Equilibrium 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Discuss the Lowry – Bronsted concept of acids and bases.
2)
Derive an expression for Ostwald’s dilution law.

12th Standard Chemistry English Medium - Ionic Equilibrium 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
A buffer solution containing 0.1 mole of ammonium hydroxide and 0.15 mole of ammonium chloride per litre of the solution. Calculate the pH of the buffer solution. K_b for ammonium hydroxide is 1.8 x 10^-5.
2)
Based on Arrhenius concept, defame acid and bases and give an example for each.
3)
What do you mean by auto ionisation of water?
4)
Define buffer Index
5)
How will you calculate solubility product from molar solubility?

12th Standard Chemistry English Medium - Ionic Equilibrium 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
The concentration of hydroxide ion in a water sample is found to be 2.5 × 10^-6M. Identify the nature of the solution.
2)
A lab assistant prepared a solution by adding a calculated quantity of HCl gas 25⁰C to get a solution with [H₃O⁺] = 4\(\times\)10^-5M. Is the solution neutral (or) acidic (or) basic.
3)
Calculate the pH of 0.04 M HNO₃ Solution.
4)
Define ionic product of water. Give its value at room temperature.
5)
Explain common ion effect with an example.

12th Standard Chemistry English Medium - Ionic Equilibrium 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Give the Limitations of Arrhenius concept theory of acids and bases.
2)
Define Buffer solution.
3)
What are the two types of buffer? Give an example for each.
4)
Define neutralisation reaction.
5)
Give a condition for a compound to be precipitated.

12th Standard Chemistry English Medium - Ionic Equilibrium 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What are Lewis acids and bases? Give two example for each.
2)
Indentify the conjugate acid base pair for the following reaction in aqueous solution
i) HS^- (aq) + HF \(\rightleftharpoons \) F^-(aq) + H₂S(aq)
ii) HPO^2-₄+ SO₃^2- \(\rightleftharpoons \) PO₄^3-+ HSO₃^-
iii) NH₄⁺+ CO₃^2- \(\rightleftharpoons \) NH₃+ HCO₃^-
3)
Account for the acidic nature of HClO₄ in terms of Bronsted – Lowry theory, identify its conjugate base.
4)
When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetra ammine copper (II) complex,\({ [Cu({ H }_{ 2 }O)_4] }_{ (aq) }^{ 2+ }+ 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }\) among H₂O and NH₃ Which is stronger Lewis base.
5)
Define solubility product.

12th Standard Chemistry English Medium - Ionic Equilibrium 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-
2)
Inert pair effect is observed in groups _______.
3)
Which one among the following in the strongest Bronsted base.
4)
Which of the following is not a Lewis acid?
5)
Analyses the equilibrium
HClO₄ +H₂O ⇌ H₃O+ \({ ClO }_{ 4 }^{ - }\)
and choose the correct statement.

12th Standard Chemistry English Medium - Ionic Equilibrium 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
Following solutions were prepared by mixing different volumes of NAOH of HCL different concentrations
1) 60 mL\(\frac{M}{10}\)HCl + 40mL\(\frac{M}{10}\)NaOH
2) 55 mL\(\frac{M}{10}\)HCl + 45mL\(\frac{M}{10}\)NaOH
3) 75 mL\(\frac{M}{5}\)HCl + 25mL\(\frac{M}{5}\)NaOH
4) 100 mL\(\frac{M}{10}\)HCl + 100mL\(\frac{M}{10}\)NaOH
pH of which one of them will be equal to 1?
3)
The solubility of BaSO₄ in water is 2.42 × 10^-3gL^-1 at 298K. The value of its solubility product(K_sp) will be (Given molar mass of BaSO₄ =233g mol^-1)
4)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
5)
Conjugate base for Bronsted acids H₂O and HF are _______.

12th Standard Chemistry English Medium - Chemical Kinetics 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
For the reaction 2A + B ⟶ A₂B. The rate = k [A] [B]² with k = 2.0 x 10^-6 mol? L²S^-1. Calculate the initial rate of the reaction, when [A] = 0.1 mol L^-1, [B] = 0.2 mol L^-1. Calculate the rate of reaction after [A] is reduced to 0.06 mol L^-1
2)
In a pseudo first order hydrolysis of ester in water, the following results were obtained.

1 0 30 60 90

[Ester]mol L^-1 0.55 0.31 0.17 0.085

(i) Calculate the average rate of reaction between the time interval 30 to 60 seconds.
(i) Calculate the pseudo first order rate constant for the hydrolysis of ester.
3)
Write an account of the Arrhenius equation for rates of chemical reactions.
4)
State the characteristics of order of reactions.
5)
For the reaction R - P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and second.

1	0	30	60	90
[Ester]mol L^-1	0.55	0.31	0.17	0.085

12th Standard Chemistry English Medium - Chemical Kinetics 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
What is an elementary reaction? Give the differences between order and molecularity of a reaction.

12th Standard Chemistry English Medium - Chemical Kinetics 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Hydrolysis of methyl acetate in aqueous solution has been studied by titrating the liberated acetic acid against sodium hydroxide. The concentration of an ester at different temperatures is given below.

t(min) 0 20 40 60 ∝

v (ml) 20.2 25.6 29.5 32.8 50.4

Show that the reaction is the first order reactions.
2)
Prove that the time required for the completion \({ \frac { 3 }{ 4 } }^{ th }\) of the reaction of a first order is twice the time required for the completion of a half of the reaction.
3)
(i) Molecularity of any reaction is not equal to zero. Why?
(ii) For which type of reactions, order, and molecularity have the same value?
4)
A reaction is of second order in A and first order in B.
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentration of A three times?
(iii) How is the rate affected when the concentration of both A and B is doubled?
5)
Give examples for first order reaction.

t(min)	0	20	40	60	∝
v (ml)	20.2	25.6	29.5	32.8	50.4

12th Standard Chemistry English Medium - Chemical Kinetics 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 02, 2022 - View & Read

1)
Define average rate and instantaneous rate.
2)
Define rate law and rate constant.
3)
Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product.
4)
Define half life of a reaction. Show that for a first order reaction half life is independent of initial concentration.
5)
Explain the rate determining step with an example.

12th Standard Chemistry English Medium - Chemical Kinetics 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What is the study of chemical kinetics used for?
2)
For a reaction A + B ⟶ C, the rate of the reaction is denoted \(\frac { -dA }{ dt } \) or \(\frac { -dB }{ dt } \) or \(\frac { +dC }{ dt } \). State the significance of plus and minus sign.
3)
Rate of chemical reaction is not uniform throughout. Justify you answer:
4)
H_2(g) + Cl_2(g) \(\overset { hv }{ \longrightarrow } \) 2HCl(g). The reaction proceeds with a uniform rate throughout. What do you conclude?
5)
Why is instantaneous rate preferred over average rate?

12th Standard Chemistry English Medium - Chemical Kinetics 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Explain the effect of catalyst on reaction rate with an example.
2)
Explain briefly the collision theory of bimolecular reactions.
3)
Write Arrhenius equation and explains the terms involved.
4)
The decomposition of Cl₂O₇ at 500K in the gas phase to Cl₂ and O₂ is a first order reaction. After 1 minute at 500K, the pressure of Cl₂O₇ falls from 0.08 to 0.04 atm. Calculate the rate constant in s^-1
5)
A gas phase reaction has energy of activation 200 kJ mol^-1. If the frequency factor of the reaction is 1.6 x 10¹³s^-1. Calculate the rate constant at 600 K.(e^-40.09= 3.8 x 10^-48)

12th Standard Chemistry English Medium - Chemical Kinetics 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
2N₂O₅ ⟶ NO₂ + O₂, \(\frac { d\left[ { N }_{ 2 }{ O }_{ 5 } \right] }{ dt } \) = k₁[N₂O₅], \(\frac { d\left[ { NO }_{ 2 } \right] }{ dt } \)= k₂[N₂O₅] and \(\frac { d{ O }_{ 2 } }{ dt } \) = k ₃[N₂O₅], the relation between k₁, k₂ and k₃ is _____.
2)
What would be the rate of disappearance of oxygen, if the rate of formation of nitric oxide (NO) is 3.6 x 10^-3mol L^-1 s^-1?
3)
For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10^-4mol L^-1s^-1. Identify the rate of reaction.
4)
For the reaction, 2N₂O₅ ⟶4 NO₂+O₂, select the correct statement.
5)
In pseudo-order reactions ______.

12th Standard Chemistry English Medium - Chemical Kinetics 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
A zero order reaction X ⟶ Product, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is
3)
Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is _______.
4)
For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is
5)
For the reaction, 2NH₃ ⟶ N₂ + 3H₂, if \(\frac { -d[NH_{ 3 }] }{ dt } \) = k₁[NH₃], \(\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt } \)= k₃[NH₃] then the relation between k₁, k₂ and k₃ is _________.

12th Standard Chemistry English Medium - Solid State 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.
2)
A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body - centre. What is the formula of the compound? What is the coordination numbers of P and Q?
3)
What are the general characteristics of solids?
4)
What are molecular solids? Explain the types of molecular solids.
5)
An element with molar mass 2.7 x 10^-2 kg mol forms a cubic unit cell with edge length 405 pm. If its density is 2.7 x 10³ kg m^-3, What is the nature of the cubic unit cell?

12th Standard Chemistry English Medium - Solid State 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Differentiate crystalline solids and amorphous solids.
2)
Write short note on metal excess and metal deficiency defect with an example.
3)
Explain AAAA and ABABA and ABCABC type of three dimensional packing with the help of neat diagram.
4)
Calculate the percentage efficiency of packing in case of body centered cubic crystal.

12th Standard Chemistry English Medium - Solid State 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Experiment shows that Nickel oxide has the formula Ni_0.96.O_1.00. What fraction of Nickel exists as of Ni²⁺ and Ni³+ ions?
2)
Why are solids rigid?
3)
Silver crystallines in fcc lattice. If edge length of the cell is 4.07 x 10^-8 em and density is 10.5 g cm^-3. Calculate the atomic mass of silver
4)
If NaCI is doped with 10^-3 mol % of SrCl₂ What is the concentration of cation valencies?
5)
Why are solids incompressible?

12th Standard Chemistry English Medium - Solid State 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Give any three characteristics of ionic crystals.
2)
Explain briefly seven types of unit cell.
3)
Distinguish between hexagonal close packing and cubic close packing.
4)
Distinguish tetrahedral and octahedral voids.
5)
Explain Schottky defect.

12th Standard Chemistry English Medium - Solid State 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Why do solids have a definite volume?
2)
Classify the following as amorphous or crystalline solids. Polyurethane, Naphthalene, Benzoic acid, Teflon, Potassium nitrate, Cellophane, Polyvinyl chloride, Fiber glass, Copper.
3)
What type of stoichiometric defect is shown by ZnS.
4)
Ionic solids conduct electricity in molten state but not in solid state. Explain.
5)
Distinguish between : Face - centred and body - centred unit cells.

12th Standard Chemistry English Medium - Solid State 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Define unit cell.
2)
Classify the following solids
a. P₄
b. Brass
c. diamond
d. NaCl
e. Iodine
3)
What are point defects?
4)
Calculate the number of atoms in a fcc unit cell.
5)
Why ionic crystals are hard and brittle?

12th Standard Chemistry English Medium - Solid State 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
The number of carbon atoms per unit cell of diamond is _______.
2)
The composition of a sample of wurtzite is Fe_0.93 O_1.00 what % of Iron present in the form of Fe³⁺?
3)
Which of the following defects decreases the density of the crystal?
4)
In which of the following arrangements, octahedral voids are formed?
5)
Which of the following cannot be regarded as molecular solid?

12th Standard Chemistry English Medium - Solid State 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Graphite and diamond are ________.
2)
An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.
3)
The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.
4)
Solid CO₂ is an example of ________.
5)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.

12th Standard Chemistry English Medium - Coordination Chemistry 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Mention the type of hybridisation and magnetic property of the following complexes using VB theory a) [FeF₆]^4-b) [Fe(CN)₆]^4-
2)
Give the postulates and limitation of Werner's theory of co-ordination compounds.
3)
What are the postulates of valance bond theory? Give its limitations.
4)
Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers.
(i) K[Cr(H₂O)₂(C₂O₄)₂]
(ii) [Co(en)₃]CI₃
(iii) [Co(NH₃)₅(NO₂)](NO₃)₂
(iv) [Pt (NH₃)(H₂O)CI₂]
5)
For the complex [NiCI₄]^2- write (i) the IUPAC name (ii) The hybridisation type (iii) The shape of the complex

12th Standard Chemistry English Medium - Coordination Chemistry 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Write the postulates of Werner’s theory.
2)
A solution of [Ni(H₂O)₆]²⁺ is green, whereas a solution of [Ni(CN)₄]^2- is colorless -Explain
3)
On the basis of VB theory explain the nature of bonding in [Co(C₂O₄)₃]^3-
4)
What are the limitations of VB theory?

12th Standard Chemistry English Medium - Coordination Chemistry 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Write briefly about the applications of coordination compounds in volumetric analysis
2)
[Ni(CN)₄]^2- is diamagnetic, while [NiCl₄]^2- is paramagnetic, explain using crystal field theory.
3)
How is magnitude of \({ \triangle }_{ 0 }\) affected by (i) nature of ligands (ii) oxidation state of metal ion.
4)
Draw the structures of geometrical isomers of [Fe(NH₃)₂ (CN)₄]^-
5)
Aqueous copper sulphate solution (blue) gives
(i) a green precipitate with aqueous potassium fluoride.
(ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.

12th Standard Chemistry English Medium - Coordination Chemistry 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Based on VB theory explain why [Cr(NH₃)₆]³⁺ is paramagnetic, while [Ni(CN)₄]^2- is diamagnetic.
2)
Draw all possible geometrical isomers of the complex [Co(en)₂Cl₂]⁺ and identify the optically active isomer.
3)
Give one test to differentiate [Co(NH₃)₅Cl]SO₄ and [Co(NH₃)₅SO₄]Cl.
4)
Give the difference between double salts and coordination compounds.
5)
What are hydrate isomers? Explain with an example.

12th Standard Chemistry English Medium - Coordination Chemistry 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Ni²⁺ is identified using alcoholic solution of dimethyl glyoxime. Write the structural formula for the rosy red precipitate of a complex formed in the reaction.
2)
[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?
3)
Calculate the ratio of \(\frac { \left[ { Ag }^{ + } \right] }{ \left[ Ag\left( NH_{ 3 } \right) _{ 2 } \right] ^{ + } } \) in 0.2 M solution of NH_3. If the stability constant for the complex \([Ag(NH_{ 3 })_{ 2 }]^{ + }\) is 1.7 x 10⁷
4)
Write a neutral molecule in which the central atom is Sp³d² hybridised.
5)
Name the following complex using IUPAC names. [Co(en)₂(ONO)CI]CI

12th Standard Chemistry English Medium - Coordination Chemistry 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Write the formula for the co-ordination compounds.
2)
Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)₅Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]
3)
Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds.
4)
[Ti(H₂O)₆]³⁺ is coloured, while [Sc(H₂O)₆]³⁺ is colourless- explain.
5)
Give an example for complex of the type [Ma₂b₂c₂] where a, b, c are monodentate ligands and give the possible isomers.

12th Standard Chemistry English Medium - Coordination Chemistry 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Identify the ambidentate ligand among the following.
2)
An aqueous solution of (PdCI)₂ 4NH_3,when treated with excess of AgNO₃precipitated 2 moles of AgCI. Predict the secondary valency of the compound _______.
3)
The total number of electrons donated by ligands to platinum ion in [Pt(en)₂CI₂] is _______.
4)
Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is _______.
5)
Structural formula of tetra aquadichlorideo Chromium (III) chloride _______.

12th Standard Chemistry English Medium - Coordination Chemistry 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.
3)
A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?
4)
Oxidation state of Iron and the charge on the ligand NO in [Fe(H₂O)₅NO]SO₄ are_______.
5)
As per IUPAC guidelines, the name of the complex [Co(en)₂(ONO)Cl]Cl is _______.

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Predict which of the following will be coloured in aqueous solution Ti²⁺, V³⁺, Sc⁴⁺, Cu⁺, Sc³⁺, Fe³⁺, Ni²⁺ and Co³⁺
2)
Justify the following statement.
"Elements of the first transition series possess many properties different from those of heavier transition elements".
3)
Why is there a variation of atomic andionic size as we move from Sc to Zn?
4)
Write a note on the ionization enthalpy of transition elements.
5)
Write a short note on the oxidation states of 3d series elements.

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What is meant by lanthanoid contraction?
2)
Write chemical equations for the reactions involved in the manufacture of potassium permanganate from pyrolusite ore.
3)
Discuss the general characteristic of the 3d series of the transition elements with special reference to their
(i) Atomic size
(ii) Enthalpies of atomisation
4)
Complete the following equations.
(i) Cr₂O₇^2-+ 2OH^- ⟶
(ii) MnO₄^- + 4H⁺ + 3e^- ⟶
5)
What are the general properties of f-block elements? (Lanthanides and Actinides)
(i) Electronic configuration
(ii) Oxidation state
(iii) Radii of tripositive ions.

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What are transition metals? Give four examples.
2)
What are inner transition elements?
3)
Justify the position of lanthanoids and actinoids in the periodic table.
4)
Which is more stable? Fe³⁺ or Fe²⁺ - explain.
5)
Explain the variation in E⁰_{M³⁺/M²⁺} 3d series.

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Why Gd³⁺ is colourles?
2)
Explain why compounds of Cu²⁺ are coloured but those of Zn²+ are colourless.
3)
Write the electronic configuration of the element with atomic number 102.
4)
Write ionic equation for the reaction between Cr₂O₇^-2 ions and Fe²⁺ ions in acidic medium.
5)
What are coinage metals?

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Explain the oxidation states of 4d series elements.
2)
What are actinides? Give three examples.
3)
Describe the preparation of potassium dichromate.
4)
What is lanthanoid contraction and what are the effects of lanthanoid contraction?
5)
Complete the following.
a. 3MnO₄^2- + 4H⁺ ⟶?
b. C₆H₅CH₃ \(\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } } \)?
c. MnO₄^- + Fe²⁺ ⟶?
d. KMnO₄ \(\overset { \triangle }{ \underset { Red\ hot }{ \longrightarrow } } \) ?
e. Cr₂O₇^2- + 6I^- + 14H⁺ ⟶?
f. Na₂Cr₂O₇ + 2KCl ⟶?

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Which of the following compounds is colourless?
2)
The alloy of copper that contain Zinc is________.
3)
Which of the following does not give oxygen on heating?
4)
A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H₂SO₄ to a green coloured solution(C). A, B and C are respectively ________.
5)
MnO₄^- react with Br^- in alkaline P^H to give ________.

12th Standard Chemistry English Medium - Transition and Inner Transition Elements 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
2)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
3)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
4)
Which one of the following ions has the same number of unpaired electrons as present in V³⁺?
5)
The magnetic moment of Mn²⁺ ion is _______.

12th Standard Chemistry English Medium - p - Block Elements - II 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Give a detailed account of the interhalogen, compounds with special reference to the: compounds involving iodine. Draw their structures.
2)
Explain the structure of inter halogen compounds
3)
Mention the uses of helium.
4)
Give a detailed account on allotropes of sulphur.
5)
Why is dioxygen a gas but sulphur a solid?

12th Standard Chemistry English Medium - p - Block Elements - II 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Give the balanced equation for the reaction between chlorine with cold NaOH and hot NaOH.

12th Standard Chemistry English Medium - p - Block Elements - II 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What is Haber's process?
2)
Explain the reaction of ammonia with chlorine and chlorides at different conditions.
3)
Explain the structure of ammonia.
4)
Explain the commercial method of preparation of nitric acid.
5)
Name a reaction for the estimation of Ozone.

12th Standard Chemistry English Medium - p - Block Elements - II 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What are interhalogen compounds? Give examples.
2)
Give the uses of helium.
3)
Give the uses of sulphuric acid.
4)
Write the reason for the anomalous behaviour of Nitrogen.

12th Standard Chemistry English Medium - p - Block Elements - II 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
How is nitrogen prepared from liquid air?
2)
Give two uses of nitrogen.
3)
How is ammonia prepared in the lab?
4)
Give two uses of nitric acid.
5)
What is phosphoresencer?

12th Standard Chemistry English Medium - p - Block Elements - II 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What is inert pair effect?
2)
Chalcogens belongs to p-block. Give reason.
3)
Explain why fluorine always exhibit an oxidation state of -1?
4)
Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄
5)
Why fluorine is more reactive than other halogens?

12th Standard Chemistry English Medium - p - Block Elements - II 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
In the brown ring test, brown colour of the ring is due to _______.
2)
On oxidation with iodine, sulphite ion is transformed to _______.
3)
Which of the following is correct?
4)
Catenation property of group 15 elements, follow the order _______.
5)
Which of the following halides of group 15 is not hydrolysed?

12th Standard Chemistry English Medium - p - Block Elements - II 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
In which of the following, NH₃ is not used?
2)
Which is true regarding nitrogen?
3)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
4)
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.
5)
On hydrolysis, PCl₃ gives________.

12th Standard Chemistry English Medium - p - Block Elements - I 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What are the various methods by which carbon-di-oxide is prepared?
2)
How are silicates classified? Give an example for each type of silicate.
3)
Distinguish between diamond and graphite.
4)
Write note on the structure of diborane.
5)
What are silicones? Write the preparation of silicones:

12th Standard Chemistry English Medium - p - Block Elements - I 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
AlCl₃behaves like a lewis acid. Substantiate this statement.
2)
Draw the structure of boric acid.
3)
What are the uses of boric acid?
4)
What happens to boranes at high temperatures?
5)
How is boron trifluoride obtained from boron trioxide?

12th Standard Chemistry English Medium - p - Block Elements - I 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Give the uses of Borax
2)
Give the uses of silicones.
3)
Write a note on metallic nature of p-block elements.
4)
How will you convert boric acid to boron nitride?
5)
A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.

12th Standard Chemistry English Medium - p - Block Elements - I 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Write a short note on anamolous properties of the first element of p-block.
2)
Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.
3)
How is boric acid extracted from borax?
4)
Explain the formation of boron trifluoride.
5)
Draw the structure of borazole B₃N₃H₆.

12th Standard Chemistry English Medium - p - Block Elements - I 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Describe briefly allotropism in p- block elements with specific reference to carbon.
2)
What is catenation ? describe briefly the catenation property of carbon.
3)
Write a note on Fisher tropsch synthesis.
4)
Give the structure of CO and CO₂.
5)
Describe the structure of diborane.

12th Standard Chemistry English Medium - p - Block Elements - I 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
2)
Thermodynamically the most stable form of carbon is________.
3)
Lewis acid character of boron trihalides is as a follows _______.
4)
Select the incorrect statement regarding B₂H₆.
5)
The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence _______.

12th Standard Chemistry English Medium - p - Block Elements - I 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
An aqueous solution of borax is________.
2)
Boric acid is an acid because its molecule________.
3)
Which among the following is not a borane?
4)
Which of the following metals has the largest abundance in the earth’s crust?
5)
In diborane, the number of electrons that accounts for banana bonds is ________.

12th Standard Chemistry English Medium - Metallurgy 5 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Explain froth flotation, with diagram.
2)
Explain concentration by magnetic separation with diagram.
3)
In the extraction of copper, explain the smelting process.
4)
Explain refining of nickel by mond's process
5)
Explain refining of titanium by Van-Arkel method.

12th Standard Chemistry English Medium - Metallurgy 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Explain zone refining process with an example.
2)
Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K
3)
Explain the principle of electrolytic refining with an example.
4)
Give the limitations of Ellingham diagram.

12th Standard Chemistry English Medium - Metallurgy 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What is gravity separation?
2)
What is cyanide leaching? Give an example
3)
What is cementation?
4)
What is meant by ammonia leaching?
5)
Explain alkali leaching in the extraction of aluminum.

12th Standard Chemistry English Medium - Metallurgy 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.
2)
Describe a method for refining nickel. (or) Explain the Mond process of refining nickel.
3)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag
4)
Write a short note on electrochemical principles of metallurgy.

12th Standard Chemistry English Medium - Metallurgy 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?
2)
What is metallurgy?
3)
Why should we have a ecofriendly metallurgical process?
4)
Name some elements that occur as native elements.
5)
What is meant by concentration?

12th Standard Chemistry English Medium - Metallurgy 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Sep 01, 2022 - View & Read

1)
What are the differences between minerals and ores?
2)
What are the various steps involved in the extraction of pure metals from their ores?
3)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
4)
Give the uses of zinc.
5)
Explain the electrometallurgy of aluminium.

12th Standard Chemistry English Medium Metallurgy 1 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - Aug 23, 2022 - View & Read

1)
Bauxite has the composition ______.
2)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
3)
Which one of the following reaction represents calcinations?
4)
The metal oxide which cannot be reduced to metal by carbon is ________.
5)
Which of the metal is extracted by Hall-Heroult process?

12th Standard Chemistry English Medium Metallurgy 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - Aug 23, 2022 - View & Read

1)
Cupellation is a process used for the refining of________.
2)
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
3)
Which of the following is not a mineral of aluminium?
4)
Which of the following is commonly used to produce foam in froth floatation process?
5)
Among the following, one does not belong to calcination, Pick the odd one out.

12th Standard English Medium Chemistry Reduced Syllabus Annual Exam Model Question Paper with Answer key - 2021 - by Question Bank Software - Feb 27, 2021 - View & Read

1)
In Hall-Heroult process___________act as an anode.
2)
The compound that is used in nuclear reactors as protective shields and control rods is _________.
3)
Helium is used in balloons in the place of hydrogen because it is________.
4)
Which one of the following is not correct?
5)
Which one of the following complexes is not expected to exhibit isomerism?

12th Standard English Medium Chemistry Reduced Syllabus Annual Exam Model Question Paper - 2021 - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Sodium magnesium and aluminum can be obtained from their ore by________.
2)
Oxidation state of carbon in its hydrides _______.
3)
S-S bond is present in _______.
4)
The alloy of copper that contain Zinc is________.
5)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.

12th Standard English Medium Chemistry Reduced Syllabus Public Exam Model Question Paper with Answer key - 2021 - by Question Bank Software - Feb 27, 2021 - View & Read

1)
The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of________.
2)
The repeating unit in silicone is_______.
3)
The ionisation energy of Ga is higher than that of Al because of_________
4)
The magnetic moment of Mn²⁺ ion is _______.
5)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.

12th Standard English Medium Chemistry Reduced Syllabus Public Exam Model Question Paper - 2021 - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Name the process by which elements such as germanium, silicon and galium are refined.
2)
The geometry at which carbon atom in diamond are bonded to each other is _______.
3)
Pick the wrong one among the following
4)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
5)
Which one of the following will give a pair of enantiomorphs?

12th Standard English Medium Chemistry Reduced Syllabus Creative Five mark Question with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Explain refining of nickel by mond's process
2)
What are the various methods by which carbon-di-oxide is prepared?
3)
Give a detailed account on allotropes of sulphur.
4)
Explain the Deacon's process.
5)
Complete the following reactions
(i) Cr₂O₇^2- ⟶
(ii) Cr₂O₇^2- + 6I^-+ 14H⁺ ⟶
(iii) Cr₂O₇^2-+ 3S^2-+ 14H⁺ ⟶
(iv) Cr₂O₇^2- + 3SO₂+ 2H⁺ ⟶
(v) Cr₂O₇^2- + 3Sn²⁺+ 14H⁺ ⟶
(vi) K₂Cr₂O₇ + 8H₂SO₄ + 3CH₃CH₂OH ⟶
(vii) 2MnO₄^- + 5(COO)^2-+ 6H⁺ ⟶
(viii) 2MnO₄^- + 10I^-+ 16H⁺ ⟶
(ix) 2MnO₄^- + 5S^2-+ 16H⁺ ⟶
(x) 2MnO₄^- + 5NO₂^- + 6H⁺ ⟶
(xi) 2KMnO₄ + 3H₂SO₄ + 5CH₃CH₂OH ⟶
(xii) 2MnO₄^- + 5SO₃^2- + 6H⁺ ⟶

12th Standard English Medium Chemistry Reduced Syllabus Creative Three mark Question with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Explain the electrometallurgy of aluminium.
2)
Before reduction, the ore is first converted into the oxide of metal of interest. Give reason
3)
What is liquation?
4)
Write a short note on hydroboration.
5)
Describe the structure of diamond.

12th Standard English Medium Chemistry Reduced Syllabus Creative Two mark Question with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Name some common methods of ore concentration.
2)
Discuss the process of roasting with suitable example.
3)
Name some depressing agents.
4)
What are the different methods of concentration of ores?
5)
Mention the physical properties of boranes.

12th Standard English Medium Chemistry Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.
2)
Malachite has______ composition.
3)
Magnesite is_______.
4)
In the thermite proces__________is used as a reducing agent
5)
Graphite has _______.

12th Standard English Medium Chemistry Reduced Syllabus Five mark Important Questions with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Give the limitations of Ellingham diagram.
2)
Explain refining of titanium by Van-Arkel method.
3)
Deduce the oxidation number of oxygen in hypofluorous acid – HOF.
4)
Give a detailed account on allotropes of sulphur.
5)
Explain the bleaching action of Chlorine.

12th Standard English Medium Chemistry Reduced Syllabus Five mark Important Questions - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
2)
In the extraction of copper, explain the smelting process.
3)
How are silicates classified? Give an example for each type of silicate.
4)
What happens when PCl₅ is heated?
5)
Mention the uses of helium.

12th Standard English Medium Chemistry Reduced Syllabus Three mark Important Questions with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Explain zone refining process with an example.
2)
Explain alkali leaching in the extraction of aluminum.
3)
What is auto-reduction?
4)
Describe the structure of diborane.
5)
How is aluminum chloride prepared from aluminum?

12th Standard English Medium Chemistry Reduced Syllabus Three mark Important Questions - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Explain zone refining process with an example.
2)
Explain calcination with an example.
3)
Copper and silver lie low in the electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.
4)
Describe the structure of diborane.
5)
Describe the structure of diamond.

12th Standard English Medium Chemistry Reduced Syllabus Two mark Important Questions with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
2)
Name some elements that occur as native elements.
3)
What is Ellingham diagram?
4)
What is calcination? Give example.
5)
What is catenation ? describe briefly the catenation property of carbon.

12th Standard English Medium Chemistry Reduced Syllabus Two mark Important Questions - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
2)
Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?
3)
Name some elements that occur as native elements.
4)
What is leaching?
5)
Describe briefly allotropism in p- block elements with specific reference to carbon.

12th Standard English Medium Chemistry Reduced Syllabus One mark Important Questions with Answer key - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
Which one of the following is not feasible
3)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
4)
Which of the following is not true with respect to Ellingham diagram?
5)
Which of the following metals has the largest abundance in the earth’s crust?

12th Standard English Medium Chemistry Reduced Syllabus One mark Important Questions - 2021(Public Exam ) - by Question Bank Software - Feb 27, 2021 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
In the extraction of aluminium from alumina by electrolysis, cryolite is added to_______.
3)
An aqueous solution of borax is________.
4)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
5)
P₄O₆ reacts with cold water to give _______.

12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
The central dogma of molecular genetics states that the genetic information flows from______.
2)
Among the following the achiral amino acid is ______.
3)
Which one of the following is not produced by body?
4)
The number of sp² and sp³ hybridised carbon in fructose are respectively ______.
5)
The pyrimidine bases present in DNA are ______.

12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
2)
In a protein, various amino acids linked together by ______.
3)
In aqueous solution of amino acids mostly exists in ______.
4)
The secondary structure of a protein refers to ______.
5)
Complete hydrolysis of cellulose gives ______.

12th Standard Chemistry English Medium Organic Nitrogen Compounds Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C₆H₅ - NH - COC₆ H₅ this reaction is known as ______.
2)
When aniline reacts with acetic anhydride the product formed is_______.
3)
_______.
4)
When is reduced with Sn / HCl the pair of compounds formed are _______.
5)
Among the following, the reaction that proceeds through an electrophilic substitution is : _______.

12th Standard Chemistry English Medium Organic Nitrogen Compounds Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
Which one of the following will not undergo Hofmann bromamide reaction.
2)
The product formed by the reaction an aldehyde with a primary amine ________.
3)
The order of basic strength for methyl substituted amines in aqueous solution is _________.
4)
C₆H₅NO₂ \(\overset { Fe/Hel }{ \longrightarrow } A\overset { { NaNO }_{ 2 }/HCl }{ \underset { 273K }{ \longrightarrow } } B\overset { { H }_{ 2 }O }{ \underset { 283 }{ \longrightarrow } } C \) C' is _______.
5)
Ammonium salt of benzoic acid is heated strongly with and the product so formed is reduced and then treated with NaNO₂ / HCl at low temperature. The final compound formed is _______.

12th Standard Chemistry English Medium Carbonyl Compounds and carboxylic acids Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous \ AlCI }-_{3}{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)
2)
CH₃Br \(\overset { KCN }{ \longrightarrow } (A)\overset { { H }_{ 2 }{ O }^{ + } }{ \longrightarrow } (B)\overset { { PCl }_{ 5 } }{ \longrightarrow } \) (C) product (c) is ______.
3)
Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (-CHO) group is meta directing.
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
C) assertion is true but reason is false
D) both assertion and reason are false
4)
Which one of the following reaction is an example of disproportionation reaction.
5)
In which of the following reactions new carbon – carbon bond is not formed?

12th Standard Chemistry English Medium Carbonyl Compounds and carboxylic acids Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
Which of the following represents the correct order of acidity in the given compounds
2)
Identify the product formed in the reaction
3)
Which one of the following reaction is an example of disproportionation reaction.
4)
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ________.
5)
Which of the following statement is wrong?

12th Standard Chemistry English Medium Hydroxy compounds and ethers Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
In which type of parthenogenesis are only males produced?
2)
The mode of sexual reproduction in bacteria is by ______.
3)
The mature sperms are stored in the ____.
4)
The milk secreted by the mammary glands soon after child birth is called ______.
5)
Assertion(A): Head of the sperm consists of acrosome and mitochondria.
Reason(R): Acrosome contains spiral rows of mitochondria.
Codes:
(a) A and R are true, R is the correct explanation of A.
(b) A and R are true, R is not the correct explanation of A.
(c) A is true, R is false.
(d) Both A and R are false.

12th Standard Chemistry English Medium Hydroxy compounds and ethers Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
The reaction

Can be classified as ______.
2)
Among the following ethers which one will produce methyl alcohol on treatment with hot HI?
3)
Higher alcohols are not soluble in water because of ______.
4)
Compound of molecular formula C₇H₈O is a sweet smeeling liquid. A on reaction with acidified K₂Cr₂O₇ gives compound B of molecular formula C₇H₈O. B reduces Tollen's reagent A and B are respectively.
5)
Ethers in the presence of atmospheric oxygen oxidises to give hydroperoxides and dialkyl peroxides Such a spontaneous reaction by atmospheric oxygen is called ______.

12th Standard Chemistry English Medium Surface Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
Which one of the following is an example for homogeneous catalysis?
2)
Match the following

a V₂O₅ i High density polyethylene

b Ziegler – Natta ii PAN

c Peroxide iii NH₃

d Finely divided Fe iv H₂SO₄
3)
On which of the following properties does the coagulating power of an ion depend?
4)
Which among the following does not affect adsorption?
5)
Pick the odd one out.

12th Standard Chemistry English Medium Surface Chemistry Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 29, 2021 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which one of the following characteristics are associated with adsorption?
3)
Which one of the following is an example for homogeneous catalysis?
4)
Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.
5)
According to Freundlich adsorption isotherm,_______.

12th Standard Chemistry English Medium Electro Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
Faraday constant is defined as_______.
3)
While charging lead storage battery _______.
4)
Among the following cells
I) Leclanche cell
II) Nickel – Cadmium cell
III) Lead storage battery
IV) Mercury cell
Primary cells are ____.
5)
The equivalent conductance of M/36 solution of a weak monobasic acid is 6 mho cm² equivalent^-1 and at infinite dilution is 400 mho cm² equivalent^-1. The dissociation constant of this acid is ______.

12th Standard Chemistry English Medium Electro Chemistry Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
Which of the following electrolytic solution has the least specific conductance?
2)
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because _______.
3)
The equivalent conductance of M/36 solution of a weak monobasic acid is 6 mho cm² equivalent^-1 and at infinite dilution is 400 mho cm² equivalent^-1. The dissociation constant of this acid is ______.
4)
A conductivity cell has been calibrated with a 0.01M, 1:1 electrolytic solution (specific conductance (k = 1.25 x 10^-3cm^-1) in the cell and the measured resistance was 800 Ω at 25^oC. The cell constant is ______.
5)
Kohlraush's law is applied to calculate ________.

12th Standard Chemistry English Medium Ionic Equillibrium Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
3)
Which will make basic buffer?
4)
What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-
5)
If the solubility product of lead iodide is 3.2 × 10^-8, its solubility will be _______.

12th Standard Chemistry English Medium Ionic Equillibrium Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
3)
Conjugate base for Bronsted acids H₂O and HF are _______.
4)
Which will make basic buffer?
5)
MY and NY₃, are insoluble salts and have the same K_sp values of 6.2 × 10^-13 at room temperature. Which statement would be true with regard to MY and NY₃?

12th Standard Chemistry English Medium Chemical Kinetics Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
2)
What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?
3)
Which of the following statement is not correct?
4)
The given reaction 2 FeCl₃ + SnCl₂ ⟶ 2FeCl₂ + SnCl₄ is an example of ______.
5)
Activation energy of a chemical reaction can be determined by ______.

12th Standard Chemistry English Medium Chemical Kinetics Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
3)
Consider the following statements:
(i) increase in concentration of the reactant increases the rate of a zero order reaction.
(ii) rate constant k is equal to collision frequency A if E_a = 0
(iii) rate constant k is equal to collision frequency A if E_a = ∞
(iv) a plot of ln (k) vs T is a straight line.
(v) a plot of ln (k) vs \(\left( \frac { 1 }{ T } \right) \) is a straight line with a positive slope.
Correct statements are
4)
Which of the following statement is not correct?
5)
For an exothermic chemical process occurring in 2 steps as
(i) A +B ⟶ X (slow) ;
(ii) X ⟶ AB (fast)
The progress of the reaction can be best described by (x- intermediate).

12th Standard Chemistry English Medium Solid State Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
Solid CO₂ is an example of ________.
2)
In a solid atom M occupies ccp lattice and \(\left( \frac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N ________.
3)
A two dimensional solid pattern formed by two different atoms X and Y is shown below. The black and white squares represent atoms X and Y respectively. The simplest formula for the compound based on the unit cell from the pattern is _______.
4)
Which of the following cannot be regarded as molecular solid?
5)
What is the relation between diamond and graphite?

12th Standard Chemistry English Medium Solid State Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.
2)
The ionic radii of A⁺ and B⁻ are 0.98 x 10^-10 m and 1.81 x 10^-10m. the coordination number of each ion in AB is ________.
3)
The yellow colour in NaCl crystal is due to ________.
4)
Schottky defect in a crystal is observed when ______.
5)
Assertion: due to Frenkel defect, density of the crystalline solid decreases.
Reason: In Frenkel defect cation and anion leaves the crystal.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

12th Standard Chemistry English Medium Coordination Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.
3)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.
4)
A complex in which the oxidation number of the metal is zero is_______.
5)
The total number of electrons donated by ligands to platinum ion in [Pt(en)₂CI₂] is _______.

12th Standard Chemistry English Medium Coordination Chemistry Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 28, 2021 - View & Read

1)
A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?
2)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?
3)
Choose the correct statement.
4)
The total number of electrons donated by ligands to platinum ion in [Pt(en)₂CI₂] is _______.
5)
[Fe(H₂O)₆]³⁺and [Fe(CN)₆]^3-differ in _______.

12th Standard Chemistry English Medium Transition and inner transition Elements Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
2)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
3)
The correct order of increasing oxidizing power in the series _______.
4)
Which of the following statements is not true?
5)
MnO₄^- react with Br^- in alkaline P^H to give ________.

12th Standard Chemistry English Medium Transition and inner transition Elements Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
2)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
3)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
4)
The correct order of increasing oxidizing power in the series _______.
5)
The alloy of copper that contain Zinc is________.

12th Standard Chemistry English Medium P - Block Elements - II Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Which is true regarding nitrogen?
2)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
3)
The correct order of the thermal stability of hydrogen halide is_______.
4)
Which one of the following compounds is not formed?
5)
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

12th Standard Chemistry English Medium P - Block Elements - II Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
In the brown ring test, brown colour of the ring is due to _______.
2)
On hydrolysis, PCl₃ gives________.
3)
Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false
4)
Which one of the following compounds is not formed?
5)
XeF₆ on complete hydrolysis produces________.

12th Standard Chemistry English Medium P - Block Elements - I Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Boric acid is an acid because its molecule________.
2)
Oxidation state of carbon in its hydrides _______.
3)
The basic structural unit of silicates is _______.
4)
Which of these is not a monomer for a high molecular mass silicone polymer?
5)
Which of the following statements is not correct?

12th Standard Chemistry English Medium P - Block Elements - I Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Boric acid is an acid because its molecule________.
2)
In diborane, the number of electrons that accounts for banana bonds is ________.
3)
Carbon atoms in fullerene with formula C₆₀have _______hybridisation.
4)
Oxidation state of carbon in its hydrides _______.
5)
The repeating unit in silicone is_______.

12th Standard Chemistry English Medium Metallurgy Reduced Syllabus Important Questions With Answer Key 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

2)
Which one of the following is not feasible
3)
Cupellation is a process used for the refining of________.
4)
Which of the following is commonly used to produce foam in froth floatation process?
5)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.

12th Standard Chemistry English Medium Metallurgy Reduced Syllabus Important Questions 2021 - by Question Bank Software - Jan 27, 2021 - View & Read

1)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

2)
Which one of the following ores is best concentrated by froth – floatation method?
3)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
4)
The following set of reactions are used in refining Zirconium
\(Zr \text{(impure)}+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
\({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr \text{(pure)}+{ 2I }_{ 2 }\)This method is known as ______.
5)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper With Answer Key -2021 Part - 2 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
The metal oxide which cannot be reduced to metal by carbon is ________.
2)
Which of the following is used for concentrating ore in metallurgy?
3)
The geometry at which carbon atom in diamond are bonded to each other is _______.
4)
Among the following, which is the strongest oxidizing agent?
5)
The magnetic moment of Mn²⁺ ion is _______.

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper With Answer Key - 2021 Part - 1 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Zinc is obtained from ZnO by________.
2)
In the electrolytic refining of copper, which one of the following is used as anode?
3)
The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of________.
4)
Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false
5)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper - 2021 Part - 2 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
3)
Which of the following plot gives Ellingham diagram
4)
The basic structural unit of silicates is _______.
5)
XeF₆ on complete hydrolysis produces________.

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper - 2021 Part - 1 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Zinc is obtained from ZnO by________.
2)
Which of the following is not true with respect to Ellingham diagram?
3)
Oxidation state of carbon in its hydrides _______.
4)
Which of the following is strongest acid among all?
5)
Which one of the following statements related to lanthanons is incorrect?

12th Standard Chemistry English Medium Reduced Syllabus Important Questions with Answer key - 2021 Part - 2 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
Electrochemical process is used to extract_______.
3)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
4)
In the Ellingham diagram, for the formation of carbon monoxide________.
5)
\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______

12th Standard Chemistry English Medium Reduced Syllabus Important Questions with Answer key - 2021 Part - 1 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
The following set of reactions are used in refining Zirconium
\(Zr \text{(impure)}+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
\({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr \text{(pure)}+{ 2I }_{ 2 }\)This method is known as ______.
3)
In diborane, the number of electrons that accounts for banana bonds is ________.
4)
The compound that is used in nuclear reactors as protective shields and control rods is _________.
5)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

12th Standard Chemistry English Medium Reduced Syllabus Important Questions - 2021 Part - 2 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
The element that does not show catenation among the following p-block elements is ________.
2)
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
3)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
4)
The most common oxidation state of actinoids is _______.
5)
The general electronic configuration of d-block elements can be written as ________.

12th Standard Chemistry English Medium Reduced Syllabus Important Questions - 2021 Part - 1 - by Question Bank Software - Jan 27, 2021 - View & Read

1)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
2)
Name the process by which elements such as germanium, silicon and galium are refined.
3)
The element that does not show catenation among the following p-block elements is ________.
4)
The repeating unit in silicone is_______.
5)
The geometry at which carbon atom in diamond are bonded to each other is _______.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine - by Question Bank Software - Nov 05, 2020 - View & Read

1)
Which among the following is not a borane?
2)
On moving down the group 13, density ______
3)
Among the following the correct order of acidity is ________.
4)
Permanganate ion changes to ________ in acidic medium.
5)
A complex in which the oxidation number of the metal is zero is_______.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Ten - by Question Bank Software - Nov 05, 2020 - View & Read

1)
In the extraction of aluminium from alumina by electrolysis, cryolite is added to_______.
2)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
3)
On oxidation with iodine, sulphite ion is transformed to _______.
4)
Hot concentrated H₂SO₄ is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?
5)
Which of the following lanthanoid ions is diamagnetic?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Nine - by Question Bank Software - Oct 13, 2020 - View & Read

1)
In the Ellingham diagram, for the formation of carbon monoxide________.
2)
Which of the following statements is not true?
3)
The primary and secondary valencies of [CoCl₂(en)₂]SO₄ are respectively_________.
4)
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
5)
On which of the following properties does the coagulating power of an ion depend?

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Eight - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is used for concentrating ore in metallurgy?
2)
In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.
3)
The compound that is used in nuclear reactors as protective shields and control rods is _________.
4)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
5)
Coinage metals are _______.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Eight - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Electrochemical process is used to extract_______.
2)
Oxidation state of carbon in its hydrides _______.
3)
Group 14 elements have general electronic configuration _______.
4)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
5)
The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as _______.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Seven - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
2)
Na[Ag(CN)₂] is _________.
3)
Which of the following is not sp² hybridised?
4)
All elements except carbon have the tendency to show maximum covalency of six ______
5)
In acid medium, potassium permanganate oxidizes oxalic acid to _______.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Six - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
2)
Which one is correct statement for zeolite?
3)
If 'a' is the length of unit cell, then which one is correct relationship?
4)
Assertion: Rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
Reason: Rate constant also doubles
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false
d) Both assertion and reason are false.
5)
What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Seven - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Electrochemical process is used to extract_______.
2)
Duralumin is an alloy of ______.
3)
Which of the following compounds is colourless?
4)
Formula of tris(ethane-1, 2-diamine)iron(II)phosphate _______.
5)
If ‘a’ is the length of the side of the cube, the distance between the body centered atom and one corner atom in the cube will be_________.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Six - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The incorrect statement among the following is______.
2)
In Hall-Heroult process___________act as an anode.
3)
Silicones are ______.
4)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
5)
Which one of the following is not correct?

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Five - by Question Bank Software - Oct 13, 2020 - View & Read

1)
In the electrolytic refining of copper, which one of the following is used as anode?
2)
Zinc blende is_______.
3)
Aluminium is used for making alloys because of its _____
4)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
5)
An example of a chelating ligand is _______.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Five - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Zinc is obtained from ZnO by________.
2)
Sodium cyanide solution is used to extract _________from its ores
3)
The basic structural unit of silicates is _______.
4)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
5)
XeF₆ on complete hydrolysis produces________.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is used for concentrating ore in metallurgy?
2)
The basic structural unit of silicates is _______.
3)
Most easily liquefiable gas is _______.
4)
Assertion: Ce⁴⁺ is used as an oxidizing agent in volumetric analysis.
Reason: Ce⁴⁺ has the tendency of attaining +3 oxidation state.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.
5)
The coordination number of Ni(II) in [Ni(CN)₄]^2-is _______.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Four - by Question Bank Software - Oct 13, 2020 - View & Read

1)
In the Ellingham diagram, for the formation of carbon monoxide________.
2)
Identify the metal that occurs in free state.
3)
The element that does not show catenation among the following p-block elements is ________.
4)
Group 14 elements have general electronic configuration _______.
5)
On hydrolysis, PCl₃ gives________.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
2)
Identify the metal that occurs in free state.
3)
Which of the following is not sp² hybridised?
4)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
5)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following will give respective metal by self reduction?
2)
Magnetic separation it is based on the difference in the_________ of the ore and the impurities.
3)
In diborane, the number of electrons that accounts for banana bonds is ________.
4)
SiO₄^4- ion has ____ geometry.
5)
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Duralumin is an alloy of ______.
2)
On hydrolysis, PCl₃ gives________.
3)
Most easily liquefiable gas is _______.
4)
In acid medium, potassium permanganate oxidizes oxalic acid to _______.
5)
Which one of the following is not correct?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
Electrochemical process is used to extract_______.
3)
Cinnabar is the sulphide ore of_________metal.
4)
The element that does not show catenation among the following p-block elements is ________.
5)
In the brown ring test, brown colour of the ring is due to _______.

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The metal oxide which cannot be reduced to metal by carbon is ________.
2)
Which one of the following ores is best concentrated by froth – floatation method?
3)
Among the following, one does not belong to calcination, Pick the odd one out.
4)
Carbon atoms in fullerene with formula C₆₀have _______hybridisation.
5)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Wolframite ore is separated from tinstone by the process of________.
2)
The incorrect statement among the following is______.
3)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?
4)
Which of the following metals has the largest abundance in the earth’s crust?
5)
The geometry at which carbon atom in diamond are bonded to each other is _______.

12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.
2)
With regard to the strength of acids and bases, Find the incorrect statement among the following.
3)
The conjugate base of NH^-₂ is _______.
4)
How many faradays of electricity are required for the following reaction to occur MnO₄^-→ Mn²⁺
5)
Using the data given below fmd out the strongest reducing agent ______.
\({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
\({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)

12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-
2)
With regard to the strength of acids and bases, Find the incorrect statement among the following.
3)
A current strength of 3.86 A was passed through molten Calcium oxide for 41 minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is_______. (atomic mass of Ca is 40g / mol and 1F = 96500C).
4)
Which of the statements about electrolytic conductance is not true?
5)
The most effective electrolyte for the coagulation of As₂S₃Sol is _______.

12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which one of the following is not feasible
2)
The percentage of carbon in high carbon steel is_________.
3)
Which of the following metals has the largest abundance in the earth’s crust?
4)
On hydrolysis, PCl₃ gives________.
5)
Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions 2020 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which one of the following ores is best concentrated by froth – floatation method?
2)
Pick out the alloy that contains a non-metal as a constituent in it ________.
3)
The element that does not show catenation among the following p-block elements is ________.
4)
In the brown ring test, brown colour of the ring is due to _______.
5)
The correct order of increasing oxidizing power in the series _______.

12th Standard Chemistry Chemistry In Everyday Life English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Dettol is the mixture of _____________.
2)
Natural rubber has _______.
3)
Which one of the following is a bio-degradable polymer?
4)
The drug used to induce sleep is _______________.
5)
A mixture of chloro xylenol and terpinecol acts as ______________.

12th Standard Chemistry Chemistry In Everyday Life English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is an analgesic?
2)
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.
3)
Which one of the following structures represents nylon 6,6 polymer?
4)
Nylon is an example of _______.
5)
Non stick cook wares generally have a coating of a polymer, whose monomer is _______.

12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
2)
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
3)
Among the following the achiral amino acid is ______.
4)
In aqueous solution of amino acids mostly exists in ______.
5)
The pyrimidine bases present in DNA are ______.

12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which one of the following rotates the plane polarized light towards left?
2)
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Codes:
a) If both accretion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) If assertion is true but reason is false.
d) if both assertion and reason are false.
3)
In a protein, various amino acids linked together by ______.
4)
The correct statement regarding RNA and DNA respectively is ______.
5)
Vitamin B₂ is also known as ______.

12th Standard Chemistry Organic Nitrogen Compounds English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following reagent can be used to convert nitrobenzene to aniline.
2)
Which one of the following will not undergo Hofmann bromamide reaction.
3)
Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C₆H₅ - NH - COC₆ H₅ this reaction is known as ______.
4)
C₆H₅NO₂ \(\overset { Fe/Hel }{ \longrightarrow } A\overset { { NaNO }_{ 2 }/HCl }{ \underset { 273K }{ \longrightarrow } } B\overset { { H }_{ 2 }O }{ \underset { 283 }{ \longrightarrow } } C \) C' is _______.
5)
Which of the following amines does not undergo acetylation?

12th Standard Chemistry Organic Nitrogen Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The method by which aniline cannot be prepared is _________.
2)
When aniline reacts with acetic anhydride the product formed is_______.
3)
_______.
4)
Nitrobenzene on reaction with Con HNO₃ / H₂SO₄ at 80-100^oC forms which one of the following products?
5)
Secondary nitro alkanes react with nitrous acid to form _______.

12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The formation of cyanohydrin from acetone is an example of _______.
2)
Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous \ AlCI }-_{3}{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)
3)
Which of the following represents the correct order of acidity in the given compounds
4)
The IUPAC name of
5)
In which case chiral carbon is not generated by reaction with HCN?

12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.
2)
The correct structure of the product ‘A’ formed in the reaction ______.
3)
\({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is _______.
4)
Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
Reason: 2 – 2, dimethyl propanoic acid does not have \(\alpha\) - hydrogen atom
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
C) assertion is true but reason is false
D) both assertion and reason are false
5)
Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } \) C 'C' is ______.

12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.
2)
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
3)
on treatment with Con H₂SO₄, predominately gives______.
4)
Which one of the following will react with phenol to give salicyladehyde after hydrolysis.
5)
The correct IUPAC name of the compound

12th Standard Chemistry Ionic Equilibrium English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Following solutions were prepared by mixing different volumes of NAOH of HCL different concentrations
1) 60 mL\(\frac{M}{10}\)HCl + 40mL\(\frac{M}{10}\)NaOH
2) 55 mL\(\frac{M}{10}\)HCl + 45mL\(\frac{M}{10}\)NaOH
3) 75 mL\(\frac{M}{5}\)HCl + 25mL\(\frac{M}{5}\)NaOH
4) 100 mL\(\frac{M}{10}\)HCl + 100mL\(\frac{M}{10}\)NaOH
pH of which one of them will be equal to 1?
2)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
3)
Which will make basic buffer?
4)
Which of these is not likely to act as Lewis base?
5)
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.

12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is incorrect for physisorption?
2)
Fog is colloidal solution of _______.
3)
Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?
4)
Which one of the is not a surfactant?
5)
Which one of the following is an example for homogeneous catalysis?

12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
2)
The X is _______.
3)
Which one of the following is the strongest acid.
4)
Carbolic acid is _____.
5)
Assertion: Phenol is more acidic than ethanol
Reason: Phenoxide ion is resonance stabilized
Codes:
a) both assertion and reason are true and reason is the correct explanation of assertion.
b) both assertion and reason are true but reason is not the correct explanation of assertion.
c) assertion is true but reason is false
d) both assertion and reason are false.

12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which one of the following characteristics are associated with adsorption?
3)
Hair cream is _____.
4)
The most effective electrolyte for the coagulation of As₂S₃Sol is _______.
5)
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.

12th Standard Chemistry Electro Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Consider the following half cell reactions.
Mn²⁺ + 2e^- ➝ Mn E^o = -1.18V
Mn²⁺ ➝ Mn³⁺ + e^- E^o = -1.51V
The E^o for the reaction 3Mn²⁺➝ Mn + 2Mn³⁺, and the possibility of the forward reaction are respectively.
2)
Faraday constant is defined as_______.
3)
The number of electrons delivered at the cathode during electrolysis by a current of 1A in 60 seconds is ____. (charge of electron = 1.6 ×10⁻¹⁹C )
4)
While charging lead storage battery _______.
5)
In H₂-O₂fuel cell the reaction occur at cathode is _______.

12th Standard Chemistry Electro Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
The button cell used is watches function as follows
Zn (s) + Ag₂O (s) + H₂O (l) ⇌ 2Ag (s) + Zn²⁺ (aq) + 2OH^-(aq) the half cell potentials are Ag₂O (s) + H₂O (l) + 2e^- → 2Ag (s) + 2OH^- (aq) E^o= 34V and Zn (s) → Zn²⁺ (aq) + 2e⁻ E⁰ = 0.76V . The cell potential will be_______.
3)

Electrolyte KCl KNO₃ HCl NaOAC NaCl

Λ_-
(Scm² mol^-1) 149.9 145.0 426.2 91.0 126.5

Calculate Λ^o_HoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25^oC_______.
4)
How many faradays of electricity are required for the following reaction to occur MnO₄^-→ Mn²⁺
5)
During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is _____.

12th Standard Chemistry Ionic Equilibrium English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
Conjugate base for Bronsted acids H₂O and HF are _______.
3)
Which of the following fluro compounds is most likely to behave as a Lewis base?
4)
What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-
5)
The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅NH) in a 0.10M aqueous pyridine solution _______.(K_b for C₅H₅N = 1.7×10^-9) is

12th Standard Chemistry Chemical Kinetics English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
A zero order reaction X ⟶ Product, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is
2)
For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is
3)
The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the _____.
4)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
5)
In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.

12th Standard Chemistry Chemical Kinetics English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is _______.
3)
For a reaction Rate = k[acetone]^3/2 then unit of rate constant and rate of reaction respectively is _______.
4)
Consider the following statements:
(i) increase in concentration of the reactant increases the rate of a zero order reaction.
(ii) rate constant k is equal to collision frequency A if E_a = 0
(iii) rate constant k is equal to collision frequency A if E_a = ∞
(iv) a plot of ln (k) vs T is a straight line.
(v) a plot of ln (k) vs \(\left( \frac { 1 }{ T } \right) \) is a straight line with a positive slope.
Correct statements are
5)
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK^-1 mol^-1)

12th Standard Chemistry Solid State English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.
2)
Solid CO₂ is an example of ________.
3)
The composition of a sample of wurtzite is Fe_0.93 O_1.00 what % of Iron present in the form of Fe³⁺?
4)
CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.
5)
The fraction of total volume occupied by the atoms in a simple cubic is ________.

12th Standard Chemistry Solid State English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Graphite and diamond are ________.
2)
The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.
3)
Assertion: monoclinic sulphur is an example of monoclinic crystal system
Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.
4)
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (N_A is the Avogadro number)________.
5)
In a solid atom M occupies ccp lattice and \(\left( \frac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N ________.

12th Standard Chemistry Coordination Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.
2)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.
3)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.
4)
Which one of the following will give a pair of enantiomorphs?
5)
How many geometrical isomers are possible for [Pt(Py)(NH₃)(Br)(Cl)]?

12th Standard Chemistry Coordination Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
As per IUPAC guidelines, the name of the complex [Co(en)₂(ONO)Cl]Cl is _______.
3)
A magnetic moment of 1.73BM will be shown by one among the following.
4)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?
5)
Which type of isomerism is exhibited by [Pt(NH₃)₂Cl₂]?

12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
2)
Which of the following compounds is colourless?
3)
The correct order of increasing oxidizing power in the series _______.
4)
Which of the following does not give oxygen on heating?
5)
Which of the following statements is not true?

12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
2)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
3)
The magnetic moment of Mn²⁺ ion is _______.
4)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
5)
The alloy of copper that contain Zinc is________.

12th Standard Chemistry p Block Elements II English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which is true regarding nitrogen?
2)
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.
3)
On hydrolysis, PCl₃ gives________.
4)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
5)
Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

12th Standard Chemistry p Block Elements II English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
In which of the following, NH₃ is not used?
2)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
3)
P₄O₆ reacts with cold water to give _______.
4)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
5)
Among the following, which is the strongest oxidizing agent?

12th Standard Chemistry p Block Elements I English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Boric acid is an acid because its molecule________.
2)
Which of the following metals has the largest abundance in the earth’s crust?
3)
In diborane, the number of electrons that accounts for banana bonds is ________.
4)
Oxidation state of carbon in its hydrides _______.
5)
The repeating unit in silicone is_______.

12th Standard Chemistry p Block Elements I English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
An aqueous solution of borax is________.
2)
Which among the following is not a borane?
3)
In diborane, the number of electrons that accounts for banana bonds is ________.
4)
Carbon atoms in fullerene with formula C₆₀have _______hybridisation.
5)
The basic structural unit of silicates is _______.

12th Standard Chemistry Metallurgy English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
2)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
3)
Wolframite ore is separated from tinstone by the process of________.
4)
Electrochemical process is used to extract_______.
5)
Which one of the following ores is best concentrated by froth – floatation method?

12th Standard Chemistry Metallurgy English Medium Free Online Test One Mark Questions 2020 - 2021 - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Bauxite has the composition ______.
2)
Which of the metal is extracted by Hall-Heroult process?

3)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

4)
Which one of the following is not feasible
5)
Flux is a substance which is used to convert_______.

12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Five - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Pick out the alloy that contains a non-metal as a constituent in it ________.
2)
Silicones are ______.
3)
CrO₃ is coloured due to_______.
4)
Among the following complexes the one which shows zero crystal field stabilisation energy is _______.
5)
During decomposition of an activated complex.

12th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Five - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The percentage of carbon in high carbon steel is_________.
2)
The intermediate compound formation theory applies to _______reactions.
3)
Which is optically active?
4)
Which of the following gives violet colour with neutral ferric chloride solution?
5)
Oxidation of ethylene glycol with HIO₄ gives _______.

12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Four - by Question Bank Software - Oct 13, 2020 - View & Read

1)
\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.
2)
In graphite electrons are _______.
3)
Repeated use of which one of the following fertilizers would increase the activity of the soil_______.
4)
Which one of the following exhibits highest oxidation state?
5)
The name of [Pt^IV(NH₃)₂CI₂]²⁺is _______.

12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Sulphide ore is converted to oxide form by using the process________.
2)
Oxidation state exhibited by group 13 elements is ______
3)
Hot concentrated H₂SO₄ is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?
4)
Oxygen stabilises higher oxidation state because_______.
5)
IUPAC name of H₂[Ptcl₆] is _______.

12th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Four - by Question Bank Software - Oct 13, 2020 - View & Read

1)
The percentage of carbon in high carbon steel is_________.
2)
Borax is _______.
3)
The high reactivity of fluorine is due to________.
4)
A mixture of TiCl₄ and trialkyl aluminium is _________
5)
The oxidation state of the central metal ion in the complex [Co(H₂O)(CN)(en)₂]²⁺ is________.

12th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Identify the halide ore among the following
2)
Oxidation state exhibited by group 13 elements is ______
3)
Which among the following ion is not formed?
4)
Which of the following statement is correct for 3d-transition element?
5)
Among the following complexes the one which shows zero crystal field stabilisation energy is _______.

12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Name the process by which elements such as germanium, silicon and galium are refined.
2)
Which of the following oxide is amphoteric?
3)
Pick the wrong one among the following
4)
Which one of the following exhibits highest oxidation state?
5)
Naming the ligand in [M(en)₂]ⁿ⁺starts with _______.

12th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is commonly used to produce foam in froth floatation process?
2)
The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence _______.
3)
Which of the following halides of group 15 is not hydrolysed?
4)
Which of the following is wrong with respect to lanthanide contraction?
5)
The total number of electrons donated by ligands to platinum ion in [Pt(en)₂CI₂] is _______.

12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is not a mineral of aluminium?
2)
Select the incorrect statement regarding B₂H₆.
3)
Catenation property of group 15 elements, follow the order _______.
4)
Most of the transition metal ions are coloured, because of the ________.
5)
An aqueous solution of (PdCI)₂ 4NH_3,when treated with excess of AgNO₃precipitated 2 moles of AgCI. Predict the secondary valency of the compound _______.

12th Standard Chemistry English Medium Free Online Test Creative 1 Mark Questions - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
2)
Lewis acid character of boron trihalides is as a follows _______.
3)
Which of the following is correct?
4)
The catalytic activity of transition metals is due to ________.
5)
Which of the following defects decreases the density of the crystal?

12th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Wolframite ore is separated from tinstone by the process of________.
2)
The basic structural unit of silicates is _______.
3)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
4)
The magnetic moment of Mn²⁺ ion is _______.
5)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.

12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Three - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
The basic structural unit of silicates is _______.
3)
In the brown ring test, brown colour of the ring is due to _______.
4)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
5)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.

12th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which of the following is not true with respect to Ellingham diagram?
2)
The stability of +1 oxidation state increases in the sequence ________.
3)
When copper is heated with conc HNO₃ it produces ________.
4)
Which one of the following is not correct?
5)
Choose the correct statement.

12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Two - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
Which among the following is not a borane?
3)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
4)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
5)
A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

12th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
2)
Boric acid is an acid because its molecule________.
3)
Which is true regarding nitrogen?
4)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
5)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.

12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - by Question Bank Software - Oct 13, 2020 - View & Read

1)
Bauxite has the composition ______.
2)
An aqueous solution of borax is________.
3)
In which of the following, NH₃ is not used?
4)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
5)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.

12th Standard Chemistry English Medium Model 5 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain refining of nickel by mond's process
2)
What is zone refining? Describe the principle involved in the purification of the metal by this method.
3)
Distinguish between diamond and graphite.
4)
Give a detailed account on allotropes of sulphur.
5)
Complete the following equations:
a. 4NaCI + MnO₂ + 4H₂SO₄ \(\longrightarrow \)?
b. 6XeF₄ + 12H₂O\(\longrightarrow \) ?

12th Standard Chemistry English Medium Model 5 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
2)
A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.
3)
Deduce the oxidation number of oxygen in hypofluorous acid – HOF.
4)
Why do zirconium and Hafnium exhibit similar properties?
5)
Why first ionization enthalpy of chromium is lower than that of zinc?

12th Standard Chemistry English Medium Sample 5 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
In the extraction of copper, explain the smelting process.
2)
What are the various methods by which carbon-di-oxide is prepared?
3)
Why is dioxygen a gas but sulphur a solid?
4)
Explain the oxidising and reducing property of SO₂·
5)
An element 'A' occupies group number 15 and period number 3. It reacts with chlorine to give B which further reacts with chlorine to give C at 273K. Both B and C are chlorinating agents for organic compounds. C is a better chlorinating agent because it chlorinates metals also. Breasts with SO₃ and reduces it to SO₂ B has a pyramidal shape. C has trigonal bipyramidal shape by sp³d hybridisation. Identify the element A and the compounds B and C. Write the reactions.

12th Standard Chemistry English Medium Sample 5 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Give the limitations of Ellingham diagram.
2)
How will you identify borate radical?
3)
Deduce the oxidation number of oxygen in hypofluorous acid – HOF.
4)
Which is stronger reducing agent Cr²⁺ or Fe²⁺?
5)
What are hydrate isomers? Explain with an example.

12th Standard Chemistry English Medium Important 5 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
In the extraction of copper, explain the smelting process.
2)
What is zone refining? Describe the principle involved in the purification of the metal by this method.
3)
How are silicates classified? Give an example for each type of silicate.
4)
Why is dioxygen a gas but sulphur a solid?
5)
How does sulphuric acid react with metals at various conditions.

12th Standard Chemistry English Medium Important 5 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
2)
A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.
3)
Deduce the oxidation number of oxygen in hypofluorous acid – HOF.
4)
Why europium (II) is more stable than Cerium (II)?
5)
Describe the variable oxidation state of 3d series elements.

12th Standard Chemistry English Medium Model 3 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain roasting with an example.
2)
What is meant by aluminotherrnitc process?
3)
Draw the structure of boric acid.
4)
Describe the structure of fullerenes.
5)
Explain the structure of ammonia.

12th Standard Chemistry English Medium Model 3 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain the electrometallurgy of aluminium.
2)
Describe the structure of diborane.
3)
Give a reason to support that sulphuric acid is a dehydrating agent.
4)
Which is more stable? Fe³⁺ or Fe²⁺ - explain.
5)
Give one test to differentiate [Co(NH₃)₅Cl]SO₄ and [Co(NH₃)₅SO₄]Cl.

12th Standard Chemistry English Medium Sample 3 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain alkali leaching in the extraction of aluminum.
2)
Write the molecular composition of the following ores and mentions it metal: magnetite calamine and bauxite.
3)
Mention the uses of copper.
4)
How is boron trifluoride obtained from boron trioxide?
5)
Give 3 uses of carbon monoxide.

12th Standard Chemistry English Medium Sample 3 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain the electrometallurgy of aluminium.
2)
Write a short note on hydroboration.
3)
Give the uses of sulphuric acid.
4)
Explain why Cr²⁺ is strongly reducing while Mn³⁺ is strongly oxidizing.
5)
What is linkage isomerism? Explain with an example.

12th Standard Chemistry English Medium Important 3 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
What is meant by ammonia leaching?
2)
What is the role of depressants in froth flotation process?
3)
What are the applications of the Ellingham diagram?
4)
Describe the structure of fullerenes.
5)
Name a reaction for the estimation of Ozone.

12th Standard Chemistry English Medium Important 3 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Sep 03, 2020 - View & Read

1)
Explain zone refining process with an example.
2)
Describe the structure of diborane.
3)
How will you prepare chlorine in the laboratory?
4)
Give the uses of argon.
5)
Calculate the number of unpaired electrons in Ti³⁺ , Mn²⁺ and calculate the spin only magnetic moment.

12th Standard Chemistry English Medium Model 2 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
Name the two steps involved in the extraction of crude metal
2)
List out the commercial uses of iron.
3)
Write the reaction of diboranes with water and alkali.
4)
Give the formula of chlorosilazanes. Explain its preparation from SiCI₄.
5)
Which one is more soluble in diethyl ether, anhydrous Alcl₃ or hydrated Alcl₃? Explain in terms of bonding.

12th Standard Chemistry English Medium Model 2 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
What are the differences between minerals and ores?
2)
Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.
3)
Give the uses of helium.
4)
What are actinides? Give three examples.
5)
[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?

12th Standard Chemistry English Medium Sample 2 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
What is meant by concentration?
2)
Write the two similarities between calcination and roasting.
3)
Name and discuss the principle involved in obtaining silicon of high purity.
4)
Mention the physical properties of boranes.
5)
What are the uses of silicon tetra chloride?

12th Standard Chemistry English Medium Sample 2 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?
2)
Give the uses of Borax
3)
Give the uses of helium.
4)
Why Gd³⁺ is colourles?
5)
Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds.

12th Standard Chemistry English Medium Important 2 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
Name some reducing agents used to convert Metal oxides to metal
2)
What is distillation?
3)
Explain the formation of boron trifluoride.
4)
What is inert pair effect?
5)
How is ammonia prepared in the lab?

12th Standard Chemistry English Medium Important 2 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 31, 2020 - View & Read

1)
Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.
2)
Explain why fluorine always exhibit an oxidation state of -1?
3)
Justify the position of lanthanoids and actinoids in the periodic table.
4)
[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?
5)
Explain briefly seven types of unit cell.

12th Standard Chemistry English Medium Model 1 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?
2)
Which one of the following element is present as a impurity in pig iron?
3)
Chemical formula of phosgene is_______.
4)
Identify the electron - deficient species
5)
Hybridisation of chromium ions and dichromate ions is ________.

12th Standard Chemistry English Medium Model 1 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
The basic structural unit of silicates is _______.
3)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
4)
Which of the following compounds is colourless?
5)
As per IUPAC guidelines, the name of the complex [Co(en)₂(ONO)Cl]Cl is _______.

12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.
2)
Sulphide ore is converted to oxide form by using the process________.
3)
Which one of the following compounds has similar structure to that of graphite?
4)
On moving down the group 13, density ______
5)
Which of the following halides of group 15 is not hydrolysed?

12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
Which of the metal is extracted by Hall-Heroult process?
2)
Oxidation state of carbon in its hydrides _______.
3)
On hydrolysis, PCl₃ gives________.
4)
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
5)
Which of the following compounds is colourless?

12th Standard Chemistry English Medium Important 1 Mark Creative Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?
2)
In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.
3)
\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.
4)
Malachite has______ composition.
5)
Galena is_______.

12th Standard Chemistry English Medium Important 1 Mark Book Back Questions (New Syllabus) 2020 - by Question Bank Software - Aug 25, 2020 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
Which one of the following is not feasible
3)
Which of the following metals has the largest abundance in the earth’s crust?
4)
The basic structural unit of silicates is _______.
5)
Duralumin is an alloy of ______.

12th Standard Chemistry One Mark important Questions Book back and Creative - 2020 - by Question Bank Software - Mar 20, 2020 - View & Read

1)
Which one of the following is not feasible
2)
In the Ellingham diagram, for the formation of carbon monoxide________.
3)
The process of heating of copper pyrites to remove sulphur is called ________.
4)
\(HgS_{ (s) }+{ O }_{ 2(g) }\longrightarrow { Hg }_{ (l) }+{ SO }_{ 2 }\uparrow \) The above reaction is an example of _________reduction.
5)
Which among the following is not a borane?

12 Standard Chemistry English Medium All Chapter Book Back and Creative Two Mark Question 2020 - by Question Bank Software - Mar 07, 2020 - View & Read

1)
What are the various steps involved in the extraction of pure metals from their ores?
2)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
3)
What is leaching?
4)
List out the commercial uses of iron.
5)
Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.

12 Standard Chemistry English Medium All Chapter Book Back and Creative Three Mark Question 2020 - by Question Bank Software - Mar 07, 2020 - View & Read

1)
Give the uses of zinc.
2)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag
3)
What is meant by aluminotherrnitc process?
4)
Support the statement given below with relevant examples.
5)
Give one example for each of the following
(i) icosogens
(ii) Tetragens
(iii) pnictogens
(iv) chalcogens

12 Standard Chemistry English Medium All Chapter Book Back and Creative One Mark Question 2020 - by Question Bank Software - Mar 07, 2020 - View & Read

1)
Which one of the following reaction represents calcinations?
2)
In the Ellingham diagram, for the formation of carbon monoxide________.
3)
Malachite has______ composition.
4)
Magnetic separation it is based on the difference in the_________ of the ore and the impurities.
5)
The element that does not show catenation among the following p-block elements is ________.

12 Standard Chemistry English Medium All Chapter Book Back and Creative Five Mark Question 2020 - by Question Bank Software - Mar 07, 2020 - View & Read

1)
Explain the principle of electrolytic refining with an example.
2)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
3)
Explain froth flotation, with diagram.
4)
Explain concentration by magnetic separation with diagram.
5)
Write a note on zeolites.

12th Standard Chemistry Book Back and Creative Important Questions All Chapter II 2019-2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
2)
Which of the following is not true with respect to Ellingham diagram?
3)
Name the process by which elements such as germanium, silicon and galium are refined.
4)
Identify the halide ore among the following
5)
Ignition mixture used in aluminothermite process is ________.

12th Standard Chemistry Book Back and Creative Important Questions II 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
2)
Which of the following reduction is not thermodynamically feasible?
3)
\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.
4)
Ignition mixture used in aluminothermite process is ________.
5)
Magnesite is_______.

12th Standard Chemistry Important Questions II 2019-2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Bauxite has the composition ______.
2)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
3)
The process of heating of copper pyrites to remove sulphur is called ________.
4)
Ignition mixture used in aluminothermite process is ________.
5)
In acid leaching process the insoluble sulphide is converted into soluble sulphate and elemental_______.

12th Standard Chemistry Important Question All Chapter II 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which of the metal is extracted by Hall-Heroult process?
2)
Zinc is obtained from ZnO by________.
3)
\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______
4)
Steel is an alloy of___________
5)
Galena is_______.

12th Standard Chemistry Model Question Paper 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Wolframite ore is separated from tinstone by the process of________.
2)
Zinc is obtained from ZnO by________.
3)
Among the following, one does not belong to calcination, Pick the odd one out.
4)
Zinc is extracted from Zinc blende by________.
5)
Na[Ag(CN)₂] is _________.

12th Standard Chemistry Book Back and Creative Important Questions All Chapter I 2019-2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Bauxite has the composition ______.
2)
Electrochemical process is used to extract_______.
3)
Which one of the following element is present as a impurity in pig iron?
4)
\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______
5)
Metal oxide is converted into metal by the _______ process.

12th Standard Chemistry Book Back and Creative Important Questions I 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which one of the following is not feasible
2)
Flux is a substance which is used to convert_______.
3)
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
4)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.
5)
\(ZnS+{ 3O }_{ 2 }\overset { \Delta }{ \longrightarrow } 2ZnO+{ 2SO }_{ 2 }\uparrow \) . The above equation is an example for________.

12th Standard Chemistry Important Questions I 2019-2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

2)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

3)
Magnesite is_______.
4)
The percentage of carbon in high carbon steel is_________.
5)
In Hall-Heroult process___________act as an anode.

12th Standard Chemistry Important Question All Chapter I 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
The incorrect statement among the following is______.
2)
Which of the following plot gives Ellingham diagram
3)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.
4)
Concentration of copper glance is done by________.
5)
Froth flotation process is suitable for concentrating ______ores.

12th Standard Chemistry Public Model Question Paper IV 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
In acid leaching process the insoluble sulphide is converted into soluble sulphate and elemental_______.
2)
Oxidation state of carbon in its hydrides _______.
3)
Repeated use of which one of the following fertilizers would increase the activity of the soil_______.
4)
The magnetic moment of Mn²⁺ ion is _______.
5)
A magnetic moment of 1.73BM will be shown by one among the following.

12th Standard Chemistry Public Model Question Paper III 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Identify the metal that occurs in free state.
2)
Which of the following statements is not correct?
3)
The high reactivity of fluorine is due to________.
4)
Permanganate ion changes to ________ in acidic medium.
5)
Which one of the following complexes is not expected to exhibit isomerism?

12th Standard Chemistry Public Model Question Paper II 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

2)

Column-I		Column-II
A	Borazole	1	B(OH)₃
B	Boric acid	2	B₃N₃H₆
C	Quartz	3	Na₂[B₄O₅(OH)₄]8H₂O
D	Borax	4	SiO₂

3)
Which among the following ion is not formed?
4)
Which one of the following statements related to lanthanons is incorrect?
5)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.

12th Standard Chemistry Public Model Question Paper I 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
In Hall-Heroult process___________act as an anode.
2)
The compound that is used in nuclear reactors as protective shields and control rods is _________.
3)
The incorrect statement among the following is _________.
4)
Which one of the following statements related to lanthanons is incorrect?
5)
Which one of the following pairs represents linkage isomers?

12th Standard Chemistry Public Model Question Paper V 2019 - 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of________.
2)
The stability of +1 oxidation state increases in the sequence ________.
3)
Orthophosphorus acid on heating gives______.
4)
The magnetic moment of Mn²⁺ ion is _______.
5)
A complex in which the oxidation number of the metal is zero is_______.

12th Standard Chemistry Public Model Question Paper IV 2019 - 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Which of the following is commonly used to produce foam in froth floatation process?
2)
The repeating unit in silicone is_______.
3)
The ionisation energy of Ga is higher than that of Al because of_________
4)
Which one of the following is not correct?
5)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.

12th Standard Chemistry Public Model Question Paper III 2019 - 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Magnetic separation it is based on the difference in the_________ of the ore and the impurities.
2)
Which of the following is not sp² hybridised?
3)
Repeated use of which one of the following fertilizers would increase the activity of the soil_______.
4)
The actinoid elements which show the highest oxidation state of +7 are _______.
5)
Which one of the following complexes is not expected to exhibit isomerism?

12th Standard Chemistry Public Model Question Paper II 2019 - 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Sulphide ore is converted to oxide form by using the process________.
2)
The geometry at which carbon atom in diamond are bonded to each other is _______.
3)
Which of the following is correct?
4)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
5)
Oxidation state of Iron and the charge on the ligand NO in [Fe(H₂O)₅NO]SO₄ are_______.

12th Standard Chemistry Public Model Question Paper I 2019 - 2020 - by Question Bank Software - Feb 21, 2020 - View & Read

1)
Name the process by which elements such as germanium, silicon and galium are refined.
2)
An aqueous solution of borax is________.
3)
Pick the wrong one among the following
4)
Which one of the following ions has the same number of unpaired electrons as present in V³⁺?
5)
A complex in which the oxidation number of the metal is zero is_______.

12th standard chemistry - Metallurgy model question paper - by QB365 School - Feb 04, 2020 - View & Read

12th standard chemistry - Metallurgy five marks important questions: - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy three marks important questions - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy two marks important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy one marks important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy five marks important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy three marks important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy two marks important question - by QB365 School - Feb 04, 2020 - View & Read

12th chemistry - Metallurgy one marks important questions - by QB365 School - Feb 04, 2020 - View & Read

12th Chemistry - Chemistry In Everyday Life - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Which chemical is responsible for the antiseptic properties of dettol.
2)
What are antibiotics?
3)
Name one substance which can act as both analgesic and antipyretic.
4)
Write a note on synthetic detergents
5)
How do antiseptics differ from disinfectants?

12th Chemistry Biomolecules - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
What type of linkages hold together monomers of DNA?
2)
Give the differences between primary and secondary structure of proteins.
3)
Name the Vitamins whose deficiency cause i) rickets ii) scurvy
4)
Write the Zwitter ion structure of alanine
5)
Give any three difference between DNA and RNA.

12th Chemistry Organic Nitrogen Compounds - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Write down the possible isomers of the C₄H₉NO₂ give their IUPAC names.
2)
There are two isomers with the formula CH₃NO₂. How will you distinguish between them?
3)
What happens when
i. 2 – Nitropropane boiled with HCl
ii. Nitrobenezene undergo electrolytic reduction in strongly acidic medium.
iii. Oxidation of tert – butylamine with KMnO₄
iv. Oxidation of acetoneoxime with trifluoroperoxy acetic acid
4)
How will you convert nitrobenzene into
i. 1,3,5 - trinitrobenzene
ii. o and p- nitrophenol
iii. m – nitro aniline
iv. azoxybenzene
v. hydrozobenzene
vi. N – phenylhydroxylamine
vii. aniline
5)
Identify compounds A, B and C in the following sequence of reactions.
i) \({ C }_{ 6 }{ H }_{ 5 }NO_{ 2 }\overset { Fe/HCL }{ \longrightarrow } A\overset { HN{ O }_{ 2 } }{ \underset { 273K }{ \longrightarrow } } B\overset { { C }_{ 6 }{ H }_{ 5 }OH }{ \longrightarrow } C\)
ii) \({ C }_{ 6 }{ H }_{ 5 }N_{ 2 }cl\overset { CuCN }{ \longrightarrow } A\overset { H_{ 2 }O/H^{ + } }{ \longrightarrow } B\overset { NH_3 }{ \longrightarrow } C\)
iii) \({ C }{ H }_{ 3 }{ C }{ H }_{ 2 }I\overset { NaCN}{ \longrightarrow } A\overset {OH^-}{ \underset {Partial hydrolysis}{ \longrightarrow } } B\overset {NaOH+Br_2 }{ \longrightarrow } C\)
iv) \({ C }{ H }_{ 3 }NH_{ 2 }\overset { CH_3 Br }{ \longrightarrow } A\overset { CH_{ 3 }COCl}{ \longrightarrow } B\overset { B_2H_6 }{ \longrightarrow } C\)
v) \({ C }_{ 6 }{ H }_{ 5 }NH_{ 2 }\overset { (CH_{ 3 }CO)_{ 2 }O }{ \underset { Pyridine }{ \longrightarrow } } A\overset { HNO_{ 3 } }{ \underset { H_{ 2 }SO_{ 4 },288K }{ \longrightarrow } } B\overset { { H }_{ 2 }O/{ H }^{ + } }{ \longrightarrow C } \)
vi)

vii) \({ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i) NaN{ O }_{ 2 }/HCL }{ \underset { ii){ H }_{ 2 }O }{ \longrightarrow } } \)

12th Chemistry Carbonyl Compounds - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
How is propanoic acid is prepared starting from
(a) an alcohol
(b) an alkylhalide
(c) an alkene
2)
A Compound (A) with molecular formula C₂H₃N on acid hydrolysis gives (B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl₃ to give compound(D). Compound (D) on reduction with Zn/Hg and Conc.HCl gives (E). Identify (A), (B), (C) (D) and (E). Write the equations.
3)
Identify X and Y.
\({ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MgBr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y\)
4)
Identify A, B and C
5)
A hydrocarbon A (molecular formula C₈H₁₀) on ozonolysis gives B (C₄H₆O₂) only. Compound C (C₃H₅Br) on treatment with magnesium in dry ether gives (D) which on treatment with CO₂followed by acidification gives(C). Identify A, B and C.

12th Chemistry Hydroxy Compounds and Ethers - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction.
2)
Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI.
3)
Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.
4)
What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.
5)
Predict the major product, when 2-methyl but -2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration
(ii) Hydroboration
(iii) Hydroxylation using Baeyer's reagent

12th Chemistry Surface Chemistry - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Give two important characteristics of physisorption.
2)
Differentiate physisorption and chemisorption.
3)
In case of chemisorption, why adsorption first increases and then decreases with temperature?
4)
Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂?
5)
Heat of adsorption is greater for chemisorptions than physisorption. Why?

12th Chemistry Electro Chemistry - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Define anode and cathode
2)
Why does conductivity of a solution decrease on dilution of the solution.
3)
State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.
4)
Describe the electrolysis of molten NaCl using inert electrodes
5)
State Faraday’s Laws of electrolysis

12th Chemistry Ionic Equilibrium - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
What are Lewis acids and bases? Give two example for each.
2)
Discuss the Lowry – Bronsted concept of acids and bases.
3)
Indentify the conjugate acid base pair for the following reaction in aqueous solution
i) HS^- (aq) + HF \(\rightleftharpoons \) F^-(aq) + H₂S(aq)
ii) HPO^2-₄+ SO₃^2- \(\rightleftharpoons \) PO₄^3-+ HSO₃^-
iii) NH₄⁺+ CO₃^2- \(\rightleftharpoons \) NH₃+ HCO₃^-
4)
Account for the acidic nature of HClO₄ in terms of Bronsted – Lowry theory, identify its conjugate base.
5)
When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetra ammine copper (II) complex,\({ [Cu({ H }_{ 2 }O)_4] }_{ (aq) }^{ 2+ }+ 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }\) among H₂O and NH₃ Which is stronger Lewis base.

12th Chemistry Chemical Kinetics - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Define average rate and instantaneous rate.
2)
Define rate law and rate constant.
3)
Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product.
4)
Define half life of a reaction. Show that for a first order reaction half life is independent of initial concentration.
5)
What is an elementary reaction? Give the differences between order and molecularity of a reaction.

12th Chemistry Solid State - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Define unit cell.
2)
Give any three characteristics of ionic crystals.
3)
Differentiate crystalline solids and amorphous solids.
4)
Classify the following solids
a. P₄
b. Brass
c. diamond
d. NaCl
e. Iodine
5)
Explain briefly seven types of unit cell.

12th Chemistry Coordination Chemistry - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Write the IUPAC names for the following complexes.
2)
Write the formula for the co-ordination compounds.
3)
Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)₅Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]
4)
Ni²⁺ is identified using alcoholic solution of dimethyl glyoxime. Write the structural formula for the rosy red precipitate of a complex formed in the reaction.
5)
[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?

12th Chemistry Transition and Inner Transition Elements - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
What are transition metals? Give four examples.
2)
Explain the oxidation states of 4d series elements.
3)
What are inner transition elements?
4)
Justify the position of lanthanoids and actinoids in the periodic table.
5)
What are actinides? Give three examples.

12th Chemistry p - Block Elements II - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
What is inert pair effect?
2)
Chalcogens belongs to p-block. Give reason.
3)
Explain why fluorine always exhibit an oxidation state of -1?
4)
Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄
5)
What are interhalogen compounds? Give examples.

12th Chemistry p - Block Elements I - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
Write a short note on anamolous properties of the first element of p-block.
2)
Describe briefly allotropism in p- block elements with specific reference to carbon.
3)
Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.
4)
Give the uses of Borax
5)
What is catenation ? describe briefly the catenation property of carbon.

12th Chemistry Metallurgy - Two Marks Study Materials - by 8682895000 - Jan 22, 2020 - View & Read

1)
What are the differences between minerals and ores?
2)
What are the various steps involved in the extraction of pure metals from their ores?
3)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
4)
Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.
5)
Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

12th Chemistry - Full Portion Five Marks Questions - by 8682895000 - Jan 20, 2020 - View & Read

1)
Explain the principle of electrolytic refining with an example.
2)
Write a note on zeolites.
3)
How will you convert boric acid to boron nitride?
4)
Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.
5)
A solution of [Ni(H₂O)₆]²⁺ is green, whereas a solution of [Ni(CN)₄]^2- is colorless -Explain

12th Chemistry - Full Portion Three Marks Question Paper - by 8682895000 - Jan 20, 2020 - View & Read

1)
Give the uses of zinc.
2)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag
3)
Before reduction, the ore is first converted into the oxide of metal of interest. Give reason
4)
Write a short note on hydroboration.
5)
How will you prepare chlorine in the laboratory?

12th Chemistry - Full Portion Two Marks Question Paper - by 8682895000 - Jan 20, 2020 - View & Read

1)
What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?
2)
Write a note on Fisher tropsch synthesis.
3)
What is inert pair effect?
4)
Chalcogens belongs to p-block. Give reason.
5)
Explain the oxidation states of 4d series elements.

12th Chemistry - Public Model Question Paper 2019 - 2020 - by Question Bank Software - Jan 17, 2020 - View & Read

1)
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
2)
The basic structural unit of silicates is _______.
3)
The hybridisation and shape of SF₆ is respectively?
4)
Which of the following oxidation states is most common among the lanthanoids?
5)
A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

12th Chemistry - Chemistry In Everyday Life Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
Drugs that bind to the receptor site and inhibit its natural function are called _______.
2)
Natural rubber has _______.
3)
Which one of the following is a bio-degradable polymer?
4)
Which among the following is a modification of penicillin?
5)
Which one of the following is employed as antihistamine?

12th Chemistry - Biomolecules Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
The central dogma of molecular genetics states that the genetic information flows from______.
2)
Among the following the achiral amino acid is ______.
3)
Vitamin B₂ is also known as ______.
4)
Which is a monosaccharide among the following?
5)
Identify the reducing sugar.

12th Chemistry - Organic Nitrogen Compounds Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\) D' is________.
2)
Which of the following reaction is not correct.
3)
C₅H₁₃N reacts with HNO₂ to give an optically active compound – The compound is _______.
4)
Which among the following reactions will give a secondary amine?
5)
Identify the product of the following reaction.
CH₃Mg Br + CI - CN ⟶ ?

12th Chemistry - Carbonyl Compounds Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
In the following reaction, \(HC\equiv CH \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give _______.
2)
Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
Reason: 2 – 2, dimethyl propanoic acid does not have \(\alpha\) - hydrogen atom
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
C) assertion is true but reason is false
D) both assertion and reason are false
3)
Which one of the following reduces tollens reagent
4)
Which among the following on oxidation with alk.KMnO₄ will give butanone?
5)
Which of the following acids do not exhibit optical isomerism?

12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
2)
Carbolic acid is _____.
3)
(CH₃)₃-C-CH(OH) CH₃ \(\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow } \)X (major product)
4)
Which among the following statement are correct with regard to alkyl halides?
5)
Which one of the following would not react with cone. HCI and anhy. ZnCl₂ at room temperature?

12th Chemistry - Surface Chemistry Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?
3)
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.
4)
According to Freundlich adsorption isotherm,_______.
5)
Pick the odd one out.

12th Chemistry - Electro Chemistry Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 ×10⁻³ S cm⁻¹at 298 K is______.
3)
A current strength of 3.86 A was passed through molten Calcium oxide for 41 minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is_______. (atomic mass of Ca is 40g / mol and 1F = 96500C).
4)
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because _______.
5)
In H₂-O₂fuel cell the reaction occur at cathode is _______.

12th Chemistry - Ionic Equilibrium Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
Which of the following fluro compounds is most likely to behave as a Lewis base?
3)
The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅NH) in a 0.10M aqueous pyridine solution _______.(K_b for C₅H₅N = 1.7×10^-9) is
4)
MY and NY₃, are insoluble salts and have the same K_sp values of 6.2 × 10^-13 at room temperature. Which statement would be true with regard to MY and NY₃?
5)
Pick the strongest conjugate base among the following

12th Chemistry - Chemical Kinetics Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
For the reaction, 2NH₃ ⟶ N₂ + 3H₂, if \(\frac { -d[NH_{ 3 }] }{ dt } \) = k₁[NH₃], \(\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt } \)= k₃[NH₃] then the relation between k₁, k₂ and k₃ is _________.
2)
For a reaction Rate = k[acetone]^3/2 then unit of rate constant and rate of reaction respectively is _______.
3)
In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.
4)
For the reaction, 2N₂O₅ ⟶4 NO₂+O₂, select the correct statement.
5)
The depletion of ozone involves the following steps:
Step 1: O₂ +O \(\overset { { k }_{ 1 } }{ \underset { { k }_{ 2 } }{ \rightleftharpoons } } \) O₃ (fast)
Step 2: O₃ +O \(\overset { k }{ \longrightarrow } \) 2O₂ (slow)
The predicted order of the reaction will be ______.

12th Chemistry - Solid State Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.
2)
The number of carbon atoms per unit cell of diamond is _______.
3)
A solid compound XY has NaCl structure if the radius of the cation is 100pm, the radius of the anion will be ________.
4)
An example of metal deficiency defect _______.
5)
Which one of the following crystal has 8 : 8 structure?

12th Chemistry - Coordination Chemistry Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.
2)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.
3)
Which one of the following pairs represents linkage isomers?
4)
Structural formula of tetra aquadichlorideo Chromium (III) chloride _______.
5)
The spin only magnetic moment of [Mnfsr₄]^2- is 5.9 BM. Geometry of the complex ion is _______.

12th Chemistry - Transition and Inner Transition Elements Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
The magnetic moment of Mn²⁺ ion is _______.
2)
Which of the following compounds is colourless?
3)
Which of the following does not give oxygen on heating?
4)
The highest possible oxidation state shown by osmium in its compound is_______.
5)
Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.

12th Chemistry - p - Block Elements - II Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
On hydrolysis, PCl₃ gives________.
2)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
3)
The correct order of the thermal stability of hydrogen halide is_______.
4)
The hybridisation and shape of SF₆ is respectively?
5)
Which one of the following orders is not in accordance with the property stated against it?

12th Chemistry - p - Block Elements - I Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
The element that does not show catenation among the following p-block elements is ________.
2)
Carbon atoms in fullerene with formula C₆₀have _______hybridisation.
3)
The basic structural unit of silicates is _______.
4)
Chemical formula of phosgene is_______.
5)
SiO₄^4- ion has ____ geometry.

12th Chemistry - Metallurgy Model Question Paper 1 - by 8682895000 - Jan 06, 2020 - View & Read

1)
Which of the metal is extracted by Hall-Heroult process?
2)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
3)
Wolframite ore is separated from tinstone by the process of________.
4)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.
5)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Dettol is the mixture of _____________.
2)
Non stick cook wares generally have a coating of a polymer, whose monomer is _______.
3)
Mental diseases like schizophrenia are treated using _______ drugs.
4)
________ is an antipyretic.
5)
The monomer unit of natural rubber is _________

12th Chemistry - Biomolecules Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Which one given below is a non-reducing sugar?
2)
The pyrimidine bases present in DNA are ______.
3)
Among the following L- serine is ______.
4)
Name the base present only in RNA
5)
The amino acid without chiral carbon is

12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
The method by which aniline cannot be prepared is _________.
2)
The order of basic strength for methyl substituted amines in aqueous solution is _________.
3)
Identify X in the sequence give below
4)

The above structure represents
5)
Electrolytic reduction of nitrobenzene in strongly acidic medium gives

12th Chemistry - Carbonyl Compounds Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.
2)
Which one of the following reduces tollens reagent
3)
Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (-CHO) group is meta directing.
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
C) assertion is true but reason is false
D) both assertion and reason are false
4)
Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
5)
Identify 'X'.

12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Which one of the following is the strongest acid.
2)
(CH₃)₃-C-CH(OH) CH₃ \(\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow } \)X (major product)
3)
Assertion: Phenol is more reactive than benzene towards electrophilic substitution reaction
Reason: In the case of phenol, the intermediate arenium ion is more stabilized by resonance
Codes:
a) if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion.
c) assertion is true but reason is false
d) both assertion and reason are false.
4)
One mole of an organic compound (A) with the formula C₃H₈O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is ______.
5)
Pick out the odd one among the following.

12th Chemistry - Surface Chemistry Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Hair cream is _____.
2)
The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
(I) (NaCl) = 52
(II) ((BaCl₂) = 0.69
(III) (MgSO₄) = 0.22
The correct order of their coagulating power is ________.
3)
Which among the following does not affect adsorption?
4)
Which one of the following is correctly matched?
5)
The phenomenon of scattering of light by the sol particles is called _______.

12th Chemistry - Electro Chemistry Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Faraday constant is defined as_______.
2)
While charging lead storage battery _______.
3)
A conductivity cell has been calibrated with a 0.01M, 1:1 electrolytic solution (specific conductance (k = 1.25 x 10^-3cm^-1) in the cell and the measured resistance was 800 Ω at 25^oC. The cell constant is ______.
4)
Cell equation: A + 2B^- \(\rightarrow\)A²⁺+ 2B; A²⁺ + 2e^- \(\rightarrow\)A E^o = +0.34V and log₁₀ K = 15.6 at 300K for cell reactions find E^o for B⁺ + e⁻ \(\rightarrow\) B
5)
Which among the following is the strongest reducing agent?

12th Chemistry - Ionic Equilibrium Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
Conjugate base for Bronsted acids H₂O and HF are _______.
2)
If the solubility product of lead iodide is 3.2 × 10^-8, its solubility will be _______.
3)
Pick out the incorrect statement regarding Lewis acids and bases
4)
K_wrepresents _______.
5)
pH of buffer depends upon concentration of _______.

12th Chemistry - Chemical Kinetics Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the _____.
2)
For a reaction Rate = k[acetone]^3/2 then unit of rate constant and rate of reaction respectively is _______.
3)
In a first order reaction x ⟶ y; if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is_____.

4)

Predict the rate law of the following reaction based on the data given below
2A+B⟶C+3D

Reaction number	[A] (min)	[B] (min)	Initial rate (M s^-1)
1	0.1	0.1	x
2	0.2	0.1	2x
3	0.1	0.2	4x
4	0.2	0.2	8x

5)
During the decomposition of H₂O₂ to give dioxygen, 48 g O₂ is formed per minute at certain point of time. The rate of formation of water at this point is

12th Chemistry - Solid State Model Question Paper - by Question Bank Software - Jan 03, 2020 - View & Read

1)
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (N_A is the Avogadro number)________.
2)
A solid compound XY has NaCl structure if the radius of the cation is 100pm, the radius of the anion will be ________.
3)
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
4)
The crystal with a metal deficiency defect is ________.
5)
Which of the following is characteristic of ionic solids?

12th Chemistry - Coordination Chemistry Model Question Paper - by Question Bank Software - Jan 02, 2020 - View & Read

1)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.
2)
Which one of the following pairs represents linkage isomers?
3)
Structural formula of tetra aquadichlorideo Chromium (III) chloride _______.
4)
IUPAC name of H₂[Ptcl₆] is _______.
5)
Predict the geometry and hybridisation of Fe(Co)₅ _______.

12th Chemistry - Transition and Inner Transition Elements Model Question Paper - by Question Bank Software - Jan 02, 2020 - View & Read

1)
In acid medium, potassium permanganate oxidizes oxalic acid to _______.
2)
Which one of the following statements related to lanthanons is incorrect?
3)
Hybridisation of chromium ions and dichromate ions is ________.
4)
The landthanide contraction is responsible for the fact that _______.
5)
In black and white photography, the developed film is fixed by washing with ______.

12th Chemistry - p - Block Elements - II Model Question Paper - by Question Bank Software - Jan 02, 2020 - View & Read

1)
The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.
2)
The correct order of the thermal stability of hydrogen halide is_______.
3)
When copper is heated with conc HNO₃ it produces ________.
4)
The hybridisation and shape of SF₆ is respectively?
5)
Which one of the following orders is not in accordance with the property stated against it?

12th Chemistry - p - Block Elements - I Model Question Paper - by Question Bank Software - Jan 02, 2020 - View & Read

1)
Oxidation state of carbon in its hydrides _______.
2)
The geometry at which carbon atom in diamond are bonded to each other is _______.
3)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
4)
Thermodynamically the most stable form of carbon is________.
5)
Chemical formula of phosgene is_______.

12th Chemistry - Metallurgy Model Question Paper - by Question Bank Software - Jan 02, 2020 - View & Read

1)
Wolframite ore is separated from tinstone by the process of________.
2)
Which one of the following ores is best concentrated by froth – floatation method?
3)
Which of the following is not a mineral of aluminium?
4)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.
5)
In Hall-Heroult process___________act as an anode.

12th Chemistry - Surface Chemistry Model Question Paper - by Question Bank Software - Dec 03, 2019 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which one of the following is correctly matched?
3)
Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?
4)
According to Freundlich adsorption isotherm,_______.
5)
Which of the following interface cannot be obtained?

12th Chemistry - Electro Chemistry Model Question Paper - by Question Bank Software - Dec 03, 2019 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
Faraday constant is defined as_______.
3)
Which of the following electrolytic solution has the least specific conductance?
4)
Which of the statements about electrolytic conductance is not true?
5)
What happens during the electrolysis of molten sodium chloride?

12th Chemistry - Ionic Equilibrium Model Question Paper - by Question Bank Software - Dec 03, 2019 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
Which of these is not likely to act as Lewis base?
3)
What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-
4)
If the solubility product of lead iodide is 3.2 × 10^-8, its solubility will be _______.
5)
Pick the strongest conjugate base among the following

12th Chemistry - Chemical Kinetics Model Question Paper - by Question Bank Software - Dec 03, 2019 - View & Read

1)
For a reaction Rate = k[acetone]^3/2 then unit of rate constant and rate of reaction respectively is _______.
2)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
3)
Which of the following does not affect the rate of reaction?
4)
Which order reaction obeys the expression \({ t }_{ \frac { 1 }{ 2 } }\alpha \frac { 1 }{ \left[ A \right] } ?\)
5)
The addition of a catalyst during a chemical reaction alters which of the following quantities?

12th Chemistry - Solid State Model Question Paper - by Question Bank Software - Dec 03, 2019 - View & Read

1)
In a solid atom M occupies ccp lattice and \(\left( \frac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N ________.
2)
CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.
3)
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
4)
The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as _____.
5)
The crystal with a metal deficiency defect is ________.

12th Chemistry - p - Block Elements - II Model Question Paper - by Question Bank Software - Nov 27, 2019 - View & Read

1)
On hydrolysis, PCl₃ gives________.
2)
P₄O₆ reacts with cold water to give _______.
3)
Among the following, which is the strongest oxidizing agent?
4)
Which is dibasic?
5)
S-S bond is present in _______.

12th Chemistry - Transition and Inner Transition Elements Model Question Paper - by Question Bank Software - Nov 27, 2019 - View & Read

1)
Which of the following compounds is colourless?
2)
The correct order of increasing oxidizing power in the series _______.
3)
MnO₄^- react with Br^- in alkaline P^H to give ________.
4)
The highest possible oxidation state shown by osmium in its compound is_______.
5)
Which one of the following exhibits highest oxidation state?

12th Chemistry - Coordination Chemistry Model Question Paper - by Question Bank Software - Nov 27, 2019 - View & Read

1)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.
2)
A magnetic moment of 1.73BM will be shown by one among the following.
3)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?
4)
How many geometrical isomers are possible for [Pt(Py)(NH₃)(Br)(Cl)]?
5)
Structural formula of tetra aquadichlorideo Chromium (III) chloride _______.

preparatory exam-23/11/19 - by Little Flower Matriculation Higher Secondary School - Nov 23, 2019 - View & Read

1)
Which of the following is incorrect for physisorption?
2)
Hair cream is _____.
3)
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.
4)
Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?
5)
If x is the amount of adsorb ate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

12th Standard Chemistry - p - Block Elements - I Important Questions - by Question Bank Software - Nov 21, 2019 - View & Read

1)
In diborane, the number of electrons that accounts for banana bonds is ________.
2)
The element that does not show catenation among the following p-block elements is ________.
3)
The repeating unit in silicone is_______.
4)
The geometry at which carbon atom in diamond are bonded to each other is _______.
5)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.

12th Chemistry - Metallurgy Important Questions - by Question Bank Software - Nov 21, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Wolframite ore is separated from tinstone by the process of________.
3)
Electrochemical process is used to extract_______.
4)
Flux is a substance which is used to convert_______.
5)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

12th Chemistry Half Yearly Model Question Paper 2019 - by Question Bank Software - Nov 12, 2019 - View & Read

1)
The incorrect statement among the following is______.
2)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
3)
The ionisation energy of Ga is higher than that of Al because of_________
4)
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
5)
Which of these statements about [Co(CN)₆]^3- is true?

12th Chemistry - Chemistry In Everyday Life Five Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
What are narcotic and non – narcotic drugs. Give examples
2)
What are anti fertility drugs? Give examples.
3)
Write a note on co –polymer
4)
What are bio degradable polymers? Give examples.
5)
How is terylene prepared?

12th Chemistry - Hydroxy Compounds and Ethers Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
What will be the product (X and A) for the following reaction acetylchloride \(\frac{\text { i) } \mathrm{CH}_{3} \mathrm{MgBr}}{\text { ii) } \mathrm{H}_{3} \mathrm{O}^{+}}{\longrightarrow} \mathrm{X} \stackrel{\text { acid } \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}{\longrightarrow}\) A
2)
How will you convert acetylene into n-butyl alcohol.
3)
Predict the product A,B,X and Y in the following sequence of reaction
4)
Complete the following reactions

ii) \(C_6H_5-CH_{2}CH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow\)
5)
Phenol is distilled with Zn dust followed by friedel – crafts alkylation with prophyl chloride to give a compound B, B on oxidation gives (c) Indentify A,B and C.

12th Chemistry - Surface Chemistry Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
Give three uses of emulsions.
2)
Why does bleeding stop by rubbing moist alum
3)
Why is desorption important for a substance to act as good catalyst?
4)
Comment on the statement: Colloid is not a substance but it is a state of substance.
5)
Explain any one method for coagulation.

12th Chemistry - Electro Chemistry Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
Calculate the standard emf of the cell: Cd|Cd²⁺||Cu²⁺|Cu and determine the cell reaction. The standard reduction potentials of Cu²⁺|Cu and Cd²⁺|Cd are 0.34V and -0.40 volts respectively. Predict the feasibility of the cell reaction.
2)
In fuel cell H₂and O₂ react to produce electricity. In the process, H₂ gas is oxidised at the anode and O₂ at cathode. If 44.8 litre of H₂ at 25⁰C and 1 atm pressure reacts in 10 minutes, what is average current produced? If the entire current is used for electro deposition of Cu from Cu²⁺, how many grams of Cu deposited?
3)
The same amount of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and chromium nitrate respectively. If 2.935 g of Ni was deposited in the first cell. The amount of Cr deposited in the another cell? Give : molar mass of Nickel and chromium are 58.74 and 52gm^-1 respectively.
4)
A copper electrode is dipped in 0.1M copper sulphate solution at 25^oC. Calculate the electrode potential of copper. [Given: E⁰_Cu²⁺|Cu= 0.34V].
5)
For the cell Mg (s) Mg²⁺(aq)||Ag⁺(aq)|Ag(s), calculate the equilibrium constant at 25⁰C and maximum work that can be obtained during operation of cell. Given: \(E^{0}_{Mg^{2+}|Mg}\)=-237V and \(E^{0}_{Ag^{2+}|Ag}\) = 0.80V.

12th Chemistry - Ionic Equilibrium Five Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
Solubility product of Ag₂CrO₄ is \(1\times10^{-12}\). What is the solubility of Ag₂CrO₄ in 0.01M AgNO₃ solution?
2)
Write the expression for the solubility product of Ca₃(PO₄)₂
3)
A saturated solution, prepared by dissolving CaF₂(s) in water, has \([Ca^{2+}]=3.3\times10^{-4}M\). What is the K_sp of CaF₂?
4)
K_sp of AgCl is \(1.8\times10^{-10}\). Calculate molar solubility in 1 M AgNO₃
5)
A particular saturated solution of silver chromate Ag₂CrO₄ has \([Ag^{+}]=5\times10^{-5}\) and \([CrO_{4}]^{2-}=4.4\times10^{-4}M\). What is the value of K_sp for Ag₂ CrO₄?

12th Chemistry - Hydroxy Compounds and Ethers Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
What happens when 1-phenyl ethanol is treated with acidified KMnO₄.
2)
Write the mechanism of acid catalysed dehydration of ethanol to give ethene.
3)
How is phenol prepared from
i) chloro benzene
ii) isopropyl benzene
4)
Explain Kolbe’s reaction
5)
Write the chemical equation for Williamson synthesis of 2-ethoxy – 2- methyl pentane starting from ethanol and 2 – methyl pentan -2-ol.

12th Chemistry - Surface Chemistry Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.
2)
What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?
3)
What is the difference between a sol and a gel?
4)
Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol.
5)
Addition of Alum purifies water. Why?

12th Chemistry - Electro Chemistry Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5\(\times\)10^-4 S cm⁻¹.
i) molar conductivity of the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
\(\lambda^{0}_{cation}=248.2 \ S\) cm² mol^-1
\(\lambda^{0}_{anlon}=51.8 \ S\) cm² mol^-1
2)
Arrange the following solutions in the decreasing order of specific conductance.
i) 0.01M KCl
ii) 0.005M KCl
iii) 0.1M KCl
iv) 0.25M KCl
v) 0.5M KCl
3)
Why is AC current used instead of DC in measuring the electrolytic conductance?
4)
0.1M NaCl solution is placed in two different cells having cell constant 0.5 and 0.25 cm^-1 respectively. Which of the two will have greater value of specific conductance.
5)
A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu²⁺ after electrolysis assuming volume to be constant and the current efficiency is 100%.

12th Chemistry - Ionic Equilibrium Three Marks Questions - by Question Bank Software - Nov 04, 2019 - View & Read

1)
Define ionic product of water. Give its value at room temperature.
2)
Explain common ion effect with an example.
3)
Derive an expression for Ostwald’s dilution law.
4)
Define pH.
5)
Calculate the pH of 1.5\(\times\)10^-3M solution of Ba(OH)₂

12th Chemistry - Carbonyl Compounds Two Marks Questions - by Question Bank Software - Nov 02, 2019 - View & Read

1)
How is propanoic acid is prepared starting from
(a) an alcohol
(b) an alkylhalide
(c) an alkene
2)
A Compound (A) with molecular formula C₂H₃N on acid hydrolysis gives (B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl₃ to give compound(D). Compound (D) on reduction with Zn/Hg and Conc.HCl gives (E). Identify (A), (B), (C) (D) and (E). Write the equations.
3)
Identify X and Y.
\({ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MgBr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y\)
4)
Identify A, B and C
5)
A hydrocarbon A (molecular formula C₈H₁₀) on ozonolysis gives B (C₄H₆O₂) only. Compound C (C₃H₅Br) on treatment with magnesium in dry ether gives (D) which on treatment with CO₂followed by acidification gives(C). Identify A, B and C.

12th Chemistry - Hydroxy Compounds and Ethers Two Marks Questions - by Question Bank Software - Nov 02, 2019 - View & Read

1)
Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction.
2)
Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI.
3)
Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.
4)
What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.
5)
Predict the major product, when 2-methyl but -2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration
(ii) Hydroboration
(iii) Hydroxylation using Baeyer's reagent

12th Chemistry - Surface Chemistry Two Marks Question - by Question Bank Software - Nov 02, 2019 - View & Read

1)
Give two important characteristics of physisorption.
2)
Differentiate physisorption and chemisorption.
3)
In case of chemisorption, why adsorption first increases and then decreases with temperature?
4)
Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂?
5)
Heat of adsorption is greater for chemisorptions than physisorption. Why?

12th Chemistry - Electro Chemistry Two Marks Question - by Question Bank Software - Nov 02, 2019 - View & Read

1)
Define anode and cathode
2)
Why does conductivity of a solution decrease on dilution of the solution.
3)
State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.
4)
Describe the electrolysis of molten NaCl using inert electrodes
5)
State Faraday’s Laws of electrolysis

12th Chemistry - Ionic Equilibrium Two Marks Questions - by Question Bank Software - Nov 02, 2019 - View & Read

1)
What are Lewis acids and bases? Give two example for each.
2)
Discuss the Lowry – Bronsted concept of acids and bases.
3)
Indentify the conjugate acid base pair for the following reaction in aqueous solution
i) HS^- (aq) + HF \(\rightleftharpoons \) F^-(aq) + H₂S(aq)
ii) HPO^2-₄+ SO₃^2- \(\rightleftharpoons \) PO₄^3-+ HSO₃^-
iii) NH₄⁺+ CO₃^2- \(\rightleftharpoons \) NH₃+ HCO₃^-
4)
Account for the acidic nature of HClO₄ in terms of Bronsted – Lowry theory, identify its conjugate base.
5)
When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetra ammine copper (II) complex,\({ [Cu({ H }_{ 2 }O)_4] }_{ (aq) }^{ 2+ }+ 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }\) among H₂O and NH₃ Which is stronger Lewis base.

12th Chemistry - Chemistry In Everyday Life One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
Which of the following is an analgesic?
2)
Dettol is the mixture of _____________.
3)
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.
4)
Saccharin, an artificial sweetener is manufactured from ____________.
5)
Drugs that bind to the receptor site and inhibit its natural function are called _______.

12th Chemistry - Biomolecules One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
Which one of the following rotates the plane polarized light towards left?
2)
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
3)
Which one given below is a non-reducing sugar?
4)
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
5)
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Codes:
a) If both accretion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) If assertion is true but reason is false.
d) if both assertion and reason are false.

12th Chemistry - Organic Nitrogen Compounds One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
Which of the following reagent can be used to convert nitrobenzene to aniline.
2)
The method by which aniline cannot be prepared is _________.
3)
Which one of the following will not undergo Hofmann bromamide reaction.
4)
Assertion: Acetamide on reaction with KOH and bromine gives acetic acid
Reason: Bromine catalyses hydrolysis of acetamide.
Codes:
a) if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion.
c) assertion is true but reason is false
d) both assertion and reason are false.
5)
CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\) D' is________.

12th Chemistry - Carbonyl Compounds One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
The correct structure of the product ‘A’ formed in the reaction ______.
2)
The formation of cyanohydrin from acetone is an example of _______.
3)
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.
4)
In the following reaction, \(HC\equiv CH \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give _______.
5)
\({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is _______.

12th Chemistry - Hydroxy Compounds and Ethers One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
2)
Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.
3)
The X is _______.
4)
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
5)
Which one of the following is the strongest acid.

12th Chemistry - Surface Chemistry One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which of the following is incorrect for physisorption?
3)
Which one of the following characteristics are associated with adsorption?
4)
Fog is colloidal solution of _______.
5)
Assertion: Coagulation power of Al³⁺ is more than Na⁺.
Reason: greater the valency of the flocculating ion added, greater is its power to cause precipitation.
Codes:
a) if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

12th Chemistry - Electro Chemistry One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
Consider the following half cell reactions.
Mn²⁺ + 2e^- ➝ Mn E^o = -1.18V
Mn²⁺ ➝ Mn³⁺ + e^- E^o = -1.51V
The E^o for the reaction 3Mn²⁺➝ Mn + 2Mn³⁺, and the possibility of the forward reaction are respectively.
3)
The button cell used is watches function as follows
Zn (s) + Ag₂O (s) + H₂O (l) ⇌ 2Ag (s) + Zn²⁺ (aq) + 2OH^-(aq) the half cell potentials are Ag₂O (s) + H₂O (l) + 2e^- → 2Ag (s) + 2OH^- (aq) E^o= 34V and Zn (s) → Zn²⁺ (aq) + 2e⁻ E⁰ = 0.76V . The cell potential will be_______.
4)
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 ×10⁻³ S cm⁻¹at 298 K is______.
5)

Electrolyte KCl KNO₃ HCl NaOAC NaCl

Λ_-
(Scm² mol^-1) 149.9 145.0 426.2 91.0 126.5

Calculate Λ^o_HoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25^oC_______.

12th Chemistry - Ionic Equilibrium One Mark Questions with Answer - by Question Bank Software - Nov 01, 2019 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
Following solutions were prepared by mixing different volumes of NAOH of HCL different concentrations
1) 60 mL\(\frac{M}{10}\)HCl + 40mL\(\frac{M}{10}\)NaOH
2) 55 mL\(\frac{M}{10}\)HCl + 45mL\(\frac{M}{10}\)NaOH
3) 75 mL\(\frac{M}{5}\)HCl + 25mL\(\frac{M}{5}\)NaOH
4) 100 mL\(\frac{M}{10}\)HCl + 100mL\(\frac{M}{10}\)NaOH
pH of which one of them will be equal to 1?
3)
The solubility of BaSO₄ in water is 2.42 × 10^-3gL^-1 at 298K. The value of its solubility product(K_sp) will be (Given molar mass of BaSO₄ =233g mol^-1)
4)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
5)
Conjugate base for Bronsted acids H₂O and HF are _______.

12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Kala - Bodinayakanur - Oct 31, 2019 - View & Read

1)
Which of the following is an analgesic?
2)
Saccharin, an artificial sweetener is manufactured from ____________.
3)
Aspirin is a/an _______.
4)
Natural rubber has _______.
5)
Nylon is an example of _______.

12th Chemistry - Biomolecules Model Question Paper - by Kala - Bodinayakanur - Oct 31, 2019 - View & Read

1)
Which one of the following rotates the plane polarized light towards left?
2)
Which one given below is a non-reducing sugar?
3)
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
4)
The central dogma of molecular genetics states that the genetic information flows from______.
5)
In a protein, various amino acids linked together by ______.

12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Kala - Bodinayakanur - Oct 31, 2019 - View & Read

1)
Which of the following reagent can be used to convert nitrobenzene to aniline.
2)
The method by which aniline cannot be prepared is _________.
3)
CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\) D' is________.
4)
Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C₆H₅ - NH - COC₆ H₅ this reaction is known as ______.
5)
The product formed by the reaction an aldehyde with a primary amine ________.

12th Standard Chemistry - Carbonyl Compounds Model Question Paper - by Kala - Bodinayakanur - Oct 31, 2019 - View & Read

1)
The formation of cyanohydrin from acetone is an example of _______.
2)
In the following reaction, \(HC\equiv CH \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give _______.
3)
Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } \) C 'C' is ______.
4)
Which one of the following reduces tollens reagent
5)
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid.

12th Standard Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Kala - Bodinayakanur - Oct 31, 2019 - View & Read

1)
Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.
2)
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
3)
Carbolic acid is _____.
4)
HO CH₂ CH₂ – OH on heating with periodic acid gives ______.
5)
On reacting with neutral ferric chloride, phenol gives ______.

12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
Dettol is the mixture of _____________.
2)
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.
3)
Aspirin is a/an _______.
4)
Terylene is an example of _______.
5)
Which is the monomer of neoprene in the following?

12th Chemistry - Biomolecules Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
2)
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Codes:
a) If both accretion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) If assertion is true but reason is false.
d) if both assertion and reason are false.
3)
The central dogma of molecular genetics states that the genetic information flows from______.
4)
In a protein, various amino acids linked together by ______.
5)
In aqueous solution of amino acids mostly exists in ______.

12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
The method by which aniline cannot be prepared is _________.
2)
CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\) D' is________.
3)
Which one of the following nitro compounds does not react with nitrous acid.
4)
The product formed by the reaction an aldehyde with a primary amine ________.
5)
When aniline reacts with acetic anhydride the product formed is_______.

12th Chemistry - Carbonyl Compounds Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
The formation of cyanohydrin from acetone is an example of _______.
2)
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.
3)
\({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is _______.
4)
Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous \ AlCI }-_{3}{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)
5)
Which of the following represents the correct order of acidity in the given compounds

12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
2)
Which one of the following will react with phenol to give salicyladehyde after hydrolysis.
3)
(CH₃)₃-C-CH(OH) CH₃ \(\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow } \)X (major product)
4)
In the reaction Ethanol \(\overset { { PCl }_{ 5 } }{ \longrightarrow } X\overset { alc.KOH }{ \longrightarrow } Y\overset { { H }_{ 2 }{ SO }_{ 4 }/{ H }_{ 2 }O }{ \underset { 298k }{ \longrightarrow } } Z.\) The ‘Z’ is ______.
5)
Which of the following compound can be used as antifreeze in automobile rediators?

12th Chemistry - Surface Chemistry Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which one of the following characteristics are associated with adsorption?
3)
Hair cream is _____.
4)
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.
5)
In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using K₂SO₄
(i), Na₃ PO₄
(ii), K₄ [Fe(CN)₆]
(iii) and NaCl
(iv) Their coagulating power should be

12th Chemistry - Electro Chemistry Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 ×10⁻³ S cm⁻¹at 298 K is______.
3)
During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is _____.
4)
While charging lead storage battery _______.
5)
In the electrochemical cell: Zn|ZnSO₄ _(0.01M)|| CuSO₄ _(1.0M)|Cu, the emf of this Daniel cell is E₁. When the concentration of ZnSO₄ is changed to 1.0M and that CuSO₄ changed to 0.01M, the emf changes to E₂. From the above, which one is the relationship between E₁ and E₂?

12th Chemistry - Ionic Equilibrium Model Question Paper - by Question Bank Software - Oct 30, 2019 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
3)
Conjugate base for Bronsted acids H₂O and HF are _______.
4)
Which will make basic buffer?
5)
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.

12th Standard Chemistry - Term II Model Question Paper - by Kala - Bodinayakanur - Oct 29, 2019 - View & Read

1)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
2)
Cupellation is a process used for the refining of________.
3)
The basic structural unit of silicates is _______.
4)
Most easily liquefiable gas is _______.
5)
Which of the following oxidation states is most common among the lanthanoids?

12th Standard Chemistry - Electro Chemistry Model Question Paper - by Kala - Bodinayakanur - Oct 19, 2019 - View & Read

1)
The number of electrons that have a total charge of 9650 coulombs is_______.
2)
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 ×10⁻³ S cm⁻¹at 298 K is______.
3)
During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is _____.
4)
Which of the following electrolytic solution has the least specific conductance?
5)
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because _______.

12th Standard Chemistry - Surface Chemistry Model Question Paper - by Kala - Bodinayakanur - Oct 19, 2019 - View & Read

1)
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
2)
Which of the following is incorrect for physisorption?
3)
Hair cream is _____.
4)
The most effective electrolyte for the coagulation of As₂S₃Sol is _______.
5)
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.

12th Standard Chemistry - Ionic Equilibrium Model Question Paper - by Kala - Bodinayakanur - Oct 16, 2019 - View & Read

1)
Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.24 ×10^-4mol L^-1 solubility product of Ag₂C₂O₄ is_______.
2)
pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.
3)
Which will make basic buffer?
4)
Which of these is not likely to act as Lewis base?
5)
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.

12th Standard Chemistry - Chemical Kinetics Model Question Paper - by Kala - Bodinayakanur - Oct 16, 2019 - View & Read

1)
For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is
2)
The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the _____.
3)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
4)
In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.
5)
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK^-1 mol^-1)

12th Standard Chemistry - Solid State Model Question Paper - by Kala - Bodinayakanur - Oct 09, 2019 - View & Read

1)
An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.
2)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.
3)
The number of carbon atoms per unit cell of diamond is _______.
4)
CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.
5)
The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length of the edge of the unit cell is ________.

12th Standard Chemistry - Coordination Chemistry Model Question Paper - by Kala - Bodinayakanur - Oct 09, 2019 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be _______.
3)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.
4)
A magnetic moment of 1.73BM will be shown by one among the following.
5)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?

12th Standard Chemistry - Ionic Equilibrium Three Marks Questions - by Question Bank Software - Oct 09, 2019 - View & Read

1)
Define ionic product of water. Give its value at room temperature.
2)
Explain common ion effect with an example.
3)
Define pH.
4)
Calculate the pH of 1.5\(\times\)10^-3M solution of Ba(OH)₂
5)
50ml of 0.05M HNO₃ is added to 50ml of 0.025M KOH. Calculate the pH of the resultant solution.

12th Standard Chemistry - Electro Chemistry Three Marks Questions - by Question Bank Software - Oct 09, 2019 - View & Read

1)
The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5\(\times\)10^-4 S cm⁻¹.
i) molar conductivity of the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
\(\lambda^{0}_{cation}=248.2 \ S\) cm² mol^-1
\(\lambda^{0}_{anlon}=51.8 \ S\) cm² mol^-1
2)
Arrange the following solutions in the decreasing order of specific conductance.
i) 0.01M KCl
ii) 0.005M KCl
iii) 0.1M KCl
iv) 0.25M KCl
v) 0.5M KCl
3)
Why is AC current used instead of DC in measuring the electrolytic conductance?
4)
0.1M NaCl solution is placed in two different cells having cell constant 0.5 and 0.25 cm^-1 respectively. Which of the two will have greater value of specific conductance.
5)
A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu²⁺ after electrolysis assuming volume to be constant and the current efficiency is 100%.

12th Standard Chemistry - Surface Chemistry Three Marks Questions - by Question Bank Software - Oct 09, 2019 - View & Read

1)
Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.
2)
What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?
3)
What is the difference between a sol and a gel?
4)
Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol.
5)
Addition of Alum purifies water. Why?

12th Standard Chemistry - Transition and Inner Transition Elements Model Question Paper - by Kala - Bodinayakanur - Oct 01, 2019 - View & Read

1)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
2)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
3)
The alloy of copper that contain Zinc is________.
4)
Permanganate ion changes to ________ in acidic medium.
5)
MnO₄^- react with Br^- in alkaline P^H to give ________.

12th Standard Chemistry - p - Block Elements - II Model Question Paper - by Kala - Bodinayakanur - Oct 01, 2019 - View & Read

1)
In which of the following, NH₃ is not used?
2)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
3)
The correct order of the thermal stability of hydrogen halide is_______.
4)
On oxidation with iodine, sulphite ion is transformed to _______.
5)
When copper is heated with conc HNO₃ it produces ________.

QUARTERLY EXAM - 2019 - by KRP Matriculation Hr Sec School - Oct 01, 2019 - View & Read

1)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

2)
Which of the following is not true with respect to Ellingham diagram?
3)
Which of the following is not sp² hybridised?
4)
Which one of the following compounds has similar structure to that of graphite?
5)
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.

12th Standard Chemistry - Chemical Kinetics Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
The rate of formation of a dimer in a second order reaction is 7.5 x 10^-3mol L^-1 s^-1 at 0.05 mol L^-1 monomer concentration. Calculate the rate constant.
2)
For a reaction x + y + z\(\longrightarrow \) products the rate law is given by rate =k[x]^3/2[y]^1/2. What is the overall order of the reaction and what is the order of the reaction with respect to z.
3)
Explain briefly the collision theory of bimolecular reactions.
4)
Write Arrhenius equation and explains the terms involved.
5)
The decomposition of Cl₂O₇ at 500K in the gas phase to Cl₂ and O₂ is a first order reaction. After 1 minute at 500K, the pressure of Cl₂O₇ falls from 0.08 to 0.04 atm. Calculate the rate constant in s^-1

12th Chemistry - Solid State Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
Explain Schottky defect.
2)
Write short note on metal excess and metal deficiency defect with an example.
3)
Calculate the number of atoms in a fcc unit cell.
4)
Explain AAAA and ABABA and ABCABC type of three dimensional packing with the help of neat diagram.
5)
Why ionic crystals are hard and brittle?

12th Standard Chemistry - Coordination Chemistry Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
Give an example for complex of the type [Ma₂b₂c₂] where a, b, c are monodentate ligands and give the possible isomers.
2)
Give one test to differentiate [Co(NH₃)₅Cl]SO₄ and [Co(NH₃)₅SO₄]Cl.
3)
In an octahedral crystal field, draw the figure to show splitting of d orbitals
4)
What is linkage isomerism? Explain with an example.
5)
Write briefly about the applications of coordination compounds in volumetric analysis

12th Standard Chemistry - Transition and Inner Transition Elements Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
What are interstitial compounds?
2)
Calculate the number of unpaired electrons in Ti³⁺ , Mn²⁺ and calculate the spin only magnetic moment.
3)
Write the electronic configuration of Ce⁴⁺ and Co²⁺.
4)
Explain briefly how +2 states becomes more and more stable in the first half of the first row transition elements with increasing atomic number.
5)
Which is more stable? Fe³⁺ or Fe²⁺ - explain.

12th Chemistry - p - Block Elements - II Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
Give the balanced equation for the reaction between chlorine with cold NaOH and hot NaOH.
2)
How will you prepare chlorine in the laboratory?
3)
Give the uses of sulphuric acid.
4)
Give a reason to support that sulphuric acid is a dehydrating agent.
5)
Write the reason for the anomalous behaviour of Nitrogen.

12th Chemistry - p - Block Elements - I Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
Give the uses of silicones.
2)
AlCl₃behaves like a lewis acid. Substantiate this statement.
3)
Describe the structure of diborane.
4)
Write a short note on hydroboration.
5)
Give one example for each of the following
(i) icosogens
(ii) Tetragens
(iii) pnictogens
(iv) chalcogens

12th Chemistry - Metallurgy Three Marks Questions - by Question Bank Software - Oct 01, 2019 - View & Read

1)
Explain zone refining process with an example.
2)
Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K
3)
Give the uses of zinc.
4)
Explain the electrometallurgy of aluminium.
5)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

12th Standard Chemistry - p - Block Elements - I Model Question Paper - by Kala - Bodinayakanur - Sep 27, 2019 - View & Read

1)
An aqueous solution of borax is________.
2)
The element that does not show catenation among the following p-block elements is ________.
3)
Oxidation state of carbon in its hydrides _______.
4)
The geometry at which carbon atom in diamond are bonded to each other is _______.
5)
The stability of +1 oxidation state increases in the sequence ________.

12th Standard Chemistry - Metallurgy Model Question Paper - by Kala - Bodinayakanur - Sep 27, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Electrochemical process is used to extract_______.
3)
Zinc is obtained from ZnO by________.
4)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
5)
Which of the following is used for concentrating ore in metallurgy?

12th Chemistry - Term 1 Model Question Paper - by Kala - Bodinayakanur - Sep 21, 2019 - View & Read

1)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
2)
Cupellation is a process used for the refining of________.
3)
Oxidation state of carbon in its hydrides _______.
4)
Which of these is not a monomer for a high molecular mass silicone polymer?
5)
Among the following, which is the strongest oxidizing agent?

12th Chemistry - Chemical Kinetics Two Marks Question - by Question Bank Software - Sep 19, 2019 - View & Read

1)
Define average rate and instantaneous rate.
2)
Define rate law and rate constant.
3)
Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product.
4)
Explain the effect of catalyst on reaction rate with an example.
5)
The rate law for a reaction of A, B and C has been found to be rate = k[A]²[B][L]^3/2 How would the rate of reaction change when
(i) Concentration of [L] is quadrupled
(ii) Concentration of both [A] and [B] are doubled
(iii) Concentration of [A] is halved
(iv) Concentration of [A] is reduced to \(\left(\frac{1}{3}\right)\) and concentration of [L] is quadrupled.

12th Chemistry Chapter 6 Solid State Two Marks Question - by Question Bank Software - Sep 19, 2019 - View & Read

1)
Define unit cell.
2)
Give any three characteristics of ionic crystals.
3)
Differentiate crystalline solids and amorphous solids.
4)
Classify the following solids
a. P₄
b. Brass
c. diamond
d. NaCl
e. Iodine
5)
Explain briefly seven types of unit cell.

12th Chemistry - Coordination Chemistry Two Marks Question - by Question Bank Software - Sep 19, 2019 - View & Read

1)
Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)₅Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]
2)
Based on VB theory explain why [Cr(NH₃)₆]³⁺ is paramagnetic, while [Ni(CN)₄]^2- is diamagnetic.
3)
Draw all possible geometrical isomers of the complex [Co(en)₂Cl₂]⁺ and identify the optically active isomer.
4)
[Ti(H₂O)₆]³⁺ is coloured, while [Sc(H₂O)₆]³⁺ is colourless- explain.
5)
Name the following complex using IUPAC names. [Co(en)₂(ONO)CI]CI

12th Chemistry Chapter 4 Transition and Inner Transition Elements Two Marks Question - by Question Bank Software - Sep 19, 2019 - View & Read

1)
Explain the oxidation states of 4d series elements.
2)
Justify the position of lanthanoids and actinoids in the periodic table.
3)
What are actinides? Give three examples.
4)
Complete the following.
a. 3MnO₄^2- + 4H⁺ ⟶?
b. C₆H₅CH₃ \(\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } } \)?
c. MnO₄^- + Fe²⁺ ⟶?
d. KMnO₄ \(\overset { \triangle }{ \underset { Red\ hot }{ \longrightarrow } } \) ?
e. Cr₂O₇^2- + 6I^- + 14H⁺ ⟶?
f. Na₂Cr₂O₇ + 2KCl ⟶?
5)
Write ionic equation for the reaction between Cr₂O₇^-2 ions and Fe²⁺ ions in acidic medium.

12th Chemistry - p - Block Elements - II Two Marks Questions - by Question Bank Software - Sep 16, 2019 - View & Read

1)
What is inert pair effect?
2)
Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄
3)
What are interhalogen compounds? Give examples.
4)
What is the hybridisation of iodine in IF₇? Give its structure.
5)
How is nitrogen prepared from liquid air?

12th Standard Chemistry Unit 2 p - Block Elements - I Two Marks Questions - by Question Bank Software - Sep 16, 2019 - View & Read

1)
Write a short note on anamolous properties of the first element of p-block.
2)
Describe briefly allotropism in p- block elements with specific reference to carbon.
3)
Give the uses of Borax
4)
Write a note on Fisher tropsch synthesis.
5)
Give the structure of CO and CO₂.

12th Chemistry Unit 1 Metallurgy Two Marks Questions - by Question Bank Software - Sep 16, 2019 - View & Read

1)
What are the differences between minerals and ores?
2)
What are the various steps involved in the extraction of pure metals from their ores?
3)
Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.
4)
Describe a method for refining nickel. (or) Explain the Mond process of refining nickel.
5)
What is metallurgy?

12th Chemistry - Term 1 Five Mark Model Question Paper - by Question Bank Software - Sep 16, 2019 - View & Read

1)
Explain the principle of electrolytic refining with an example.
2)
Give the limitations of Ellingham diagram.
3)
Write a note on zeolites.
4)
What happens when PCl₅ is heated?
5)
What type of hybridisation occur in
a) BrF₅
b) BrF₃

12th Chemistry Quarterly Model Question Paper - by Question Bank Software - Sep 13, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Cupellation is a process used for the refining of________.
3)
Boric acid is an acid because its molecule________.
4)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
5)
The alloy of copper that contain Zinc is________.

12th Standard Chemistry Unit 7 Chemical Kinetics Book Back Questions - by Question Bank Software - Sep 04, 2019 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
3)
In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.
4)
Assertion: Rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
Reason: Rate constant also doubles
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false
d) Both assertion and reason are false.
5)
If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is______.

12th Standard Chemistry Unit 6 Solid State Book Back Questions - by Question Bank Software - Sep 04, 2019 - View & Read

1)
Graphite and diamond are ________.
2)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.
3)
The number of carbon atoms per unit cell of diamond is _______.
4)
The composition of a sample of wurtzite is Fe_0.93 O_1.00 what % of Iron present in the form of Fe³⁺?
5)
A solid compound XY has NaCl structure if the radius of the cation is 100pm, the radius of the anion will be ________.

12th Standard Chemistry Chapter 5 Coordination Chemistry Book Back Questions - by Question Bank Software - Sep 03, 2019 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.
3)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.
4)
Which type of isomerism is exhibited by [Pt(NH₃)₂Cl₂]?
5)
How many geometrical isomers are possible for [Pt(Py)(NH₃)(Br)(Cl)]?

12th Standard Chemistry - p Block Elements - II Book Back Questions - by Question Bank Software - Sep 02, 2019 - View & Read

1)
In which of the following, NH₃ is not used?
2)
P₄O₆ reacts with cold water to give _______.
3)
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
4)
The correct order of the thermal stability of hydrogen halide is_______.
5)
Most easily liquefiable gas is _______.

12th Standard Chemistry - Transition and Inner Transition Elements Book Back Questions - by Question Bank Software - Sep 02, 2019 - View & Read

1)
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
2)
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
3)
The correct order of increasing oxidizing power in the series _______.
4)
Which of the following statements is not true?
5)
Permanganate ion changes to ________ in acidic medium.

12th Standard Chemistry Unit 2 p - Block Elements - I Book Back Questions - by Question Bank Software - Aug 31, 2019 - View & Read

1)
The element that does not show catenation among the following p-block elements is ________.
2)
Oxidation state of carbon in its hydrides _______.
3)
Which of the following is not sp² hybridised?
4)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
5)
The stability of +1 oxidation state increases in the sequence ________.

12th Standard Chemistry Metallurgy Book Back Questions - by Question Bank Software - Aug 30, 2019 - View & Read

1)
In the electrolytic refining of copper, which one of the following is used as anode?
2)
Which of the following plot gives Ellingham diagram
3)
In the Ellingham diagram, for the formation of carbon monoxide________.
4)
Which of the following reduction is not thermodynamically feasible?
5)
Which of the following is not true with respect to Ellingham diagram?

12th Standard Chemistry Chapter 1 Metallurgy One Mark Question and Answer - by Question Bank Software - Aug 29, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Which of the metal is extracted by Hall-Heroult process?
3)
Which of the following is commonly used to produce foam in froth floatation process?
4)
Among the following, one does not belong to calcination, Pick the odd one out.
5)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

12th Standard Chemistry Unit 7 Chemical Kinetics One Mark Question and Answer - by Question Bank Software - Aug 29, 2019 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
A zero order reaction X ⟶ Product, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is
3)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
4)
For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10^-4mol L^-1s^-1. Identify the rate of reaction.
5)
For the reaction, 2N₂O₅ ⟶4 NO₂+O₂, select the correct statement.

12th Standard Chemistry - Solid State One Mark Question with Answer - by Question Bank Software - Aug 28, 2019 - View & Read

1)
Graphite and diamond are ________.
2)
An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.
3)
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (N_A is the Avogadro number)________.
4)
Which of the following is characteristic of ionic solids?
5)
An example of metal deficiency defect _______.

12th Chemistry - Coordination Chemistry - One Mark Question and Answer - by Question Bank Software - Aug 27, 2019 - View & Read

1)
A magnetic moment of 1.73BM will be shown by one among the following.
2)
Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.
3)
In which of the following coordination entities the magnitude of Δ₀ will be maximum?
4)
The total number of electrons donated by ligands to platinum ion in [Pt(en)₂CI₂] is _______.
5)
Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is _______.

12th Chemistry Chapter 6 Solid State One Mark Question with Answer Key - by Question Bank Software - Aug 27, 2019 - View & Read

1)
Graphite and diamond are ________.
2)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.
3)
The number of carbon atoms per unit cell of diamond is _______.
4)
The ionic radii of A⁺ and B⁻ are 0.98 x 10^-10 m and 1.81 x 10^-10m. the coordination number of each ion in AB is ________.
5)
Which of the following cannot be regarded as molecular solid?

12th Chemistry Unit 4 Transition and Inner Transition Elements One Mark Question with Answer Key - by Question Bank Software - Aug 27, 2019 - View & Read

1)
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
2)
The correct order of increasing oxidizing power in the series _______.
3)
The alloy of copper that contain Zinc is________.
4)
In acid medium, potassium permanganate oxidizes oxalic acid to _______.
5)
Which of the following statements is not true?

12th Chemistry Unit 3 p - Block Elements - II One Mark Question Paper with Answer Key - by Question Bank Software - Aug 26, 2019 - View & Read

1)
In which of the following, NH₃ is not used?
2)
Which is true regarding nitrogen?
3)
In the brown ring test, brown colour of the ring is due to _______.
4)
On hydrolysis, PCl₃ gives________.
5)
P₄O₆ reacts with cold water to give _______.

12th Chemistry Unit 2 p - Block Elements - I One Mark Question Paper - by Question Bank Software - Aug 24, 2019 - View & Read

1)
An aqueous solution of borax is________.
2)
Boric acid is an acid because its molecule________.
3)
In diborane, the number of electrons that accounts for banana bonds is ________.
4)
The element that does not show catenation among the following p-block elements is ________.
5)
Carbon atoms in fullerene with formula C₆₀have _______hybridisation.

12th Chemistry Chapter 1 Metallurgy One Mark Question Paper - by Question Bank Software - Aug 23, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Which of the metal is extracted by Hall-Heroult process?
3)
Electrochemical process is used to extract_______.
4)
Zinc is obtained from ZnO by________.
5)
Which of the following is used for concentrating ore in metallurgy?

12th Chemistry Solid State Model Question Paper - by Question Bank Software - Aug 20, 2019 - View & Read

1)
Graphite and diamond are ________.
2)
In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.
3)
The ionic radii of A⁺ and B⁻ are 0.98 x 10^-10 m and 1.81 x 10^-10m. the coordination number of each ion in AB is ________.
4)
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
5)
Which one of the following crystal has 8 : 8 structure?

12th Chemistry Unit 5 Coordination Chemistry Model Question Paper - by Question Bank Software - Aug 12, 2019 - View & Read

1)
The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.
2)
A magnetic moment of 1.73BM will be shown by one among the following.
3)
How many geometrical isomers are possible for [Pt(Py)(NH₃)(Br)(Cl)]?
4)
Fac-mer isomerism is shown by _______.
5)
Choose the correct statement.

12th Standard Chemistry Chemical Kinetics Model Question Paper - by Question Bank Software - Aug 05, 2019 - View & Read

1)
For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
2)
A zero order reaction X ⟶ Product, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is
3)
The addition of a catalyst during a chemical reaction alters which of the following quantities?
4)
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK^-1 mol^-1)
5)
In a first order reaction x ⟶ y; if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is_____.

12th Standard Chemistry Chapter 6 Solid State Model Question Paper - by Question Bank Software - Aug 03, 2019 - View & Read

1)
Graphite and diamond are ________.
2)
The number of carbon atoms per unit cell of diamond is _______.
3)
The vacant space in bcc lattice unit cell is ________.
4)
Which of the following cannot be regarded as molecular solid?
5)
Which of the following is characteristic of ionic solids?

12th Standard Chemistry First Mid Term Model Question Paper - by Question Bank Software - Aug 01, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Wolframite ore is separated from tinstone by the process of________.
3)
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
4)
AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of _________.
5)
The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as _____.

12th Standard Chemistry Chapter 4 Transition and Inner Transition Elements Important Question Paper - by Question Bank Software - Jul 30, 2019 - View & Read

1)
Which one of the following ions has the same number of unpaired electrons as present in V³⁺?
2)
The magnetic moment of Mn²⁺ ion is _______.
3)
Which of the following compounds is colourless?
4)
Which of the following is wrong with respect to lanthanide contraction?
5)
Hybridisation of chromium ions and dichromate ions is ________.

12th Standard Chemistry Chapter 3 p - Block Elements - II Important Question Paper - by Question Bank Software - Jul 26, 2019 - View & Read

1)
In which of the following, NH₃ is not used?
2)
Which is true regarding nitrogen?
3)
An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.
4)
S-S bond is present in _______.
5)
Pick the wrong one among the following

12th Standard Chemistry Unit 2 p - Block Elements - I Important Question Paper - by Question Bank Software - Jul 24, 2019 - View & Read

1)
An aqueous solution of borax is________.
2)
Boric acid is an acid because its molecule________.
3)
Which among the following is not a borane?
4)
Lewis acid character of boron trihalides is as a follows _______.
5)
Select the incorrect statement regarding B₂H₆.

12th Chemistry - Unit 1 Important Question Paper - by Question Bank Software - Jul 18, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
3)
Which one of the following reaction represents calcinations?
4)
Which of the following is not a mineral of aluminium?
5)
Which of the following is commonly used to produce foam in froth floatation process?

model test question paper for new syllabus state board english medium in chemistry chapter one metallurgy - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
3)
Which one of the following reaction represents calcinations?
4)
The metal oxide which cannot be reduced to metal by carbon is ________.
5)
Which of the metal is extracted by Hall-Heroult process?

chemistrty most asked creative five mark questions in chapter one english medium - by Mohan Raj - Jun 27, 2019 - View & Read

1)
List out the application of aluminum.
2)
List the applications of iron.
3)
How can you separate alumina from silica in a bauxite ore.
4)
What is zone refining? Describe the principle involved in the purification of the metal by this method.
5)
Write short note on the following:
(i) The process in which no external reducing agent is used.
(ii) The process which is used for highly electro positive metal.
(iii) Write the equation involved in the thermite process.

chapter one creative five mark questions chemistry english medium - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Explain froth flotation, with diagram.
2)
Explain concentration by magnetic separation with diagram.
3)
In the extraction of copper, explain the smelting process.
4)
Explain refining of nickel by mond's process
5)
Explain refining of titanium by Van-Arkel method.

english medium stateboard most important five mark questuions in chemistry chapter one metallurgy - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.
2)
Explain the principle of electrolytic refining with an example.
3)
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
4)
Give the limitations of Ellingham diagram.
5)
Write a short note on electrochemical principles of metallurgy.

important three mark questions in chemistry metallurgy for state board english medium - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Write the molecular composition of the following ores and mentions it metal: magnetite calamine and bauxite.
2)
(i) Which of the following metals cannot: be extracted by the smelting process: 1 AI, Zn, Fe and Pb. Give reasons.
(ii) Which one is a good reducing agent (C or CO) for Fe₂O₃, below 1073 k?
3)
What is coupling of reaction? How is it useful in metallurgy?
4)
Explain how the metal oxide is converted into metal using carbon as a reducing agent.
5)
How oxides of metals are reduced by hydrogen?

chemistry chapter one creative three mark questions for +2 english medium - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Explain alkali leaching in the extraction of aluminum.
2)
How is acid leaching done for the sulphide ores?
3)
Before reduction, the ore is first converted into the oxide of metal of interest. Give reason
4)
Explain roasting with an example.
5)
Explain calcination with an example.

Frequently asked three mark questions chemistry 12th standard unit one metallurgy in chemistry - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Explain zone refining process with an example.
2)
Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K
3)
Give the uses of zinc.
4)
Explain the electrometallurgy of aluminium.
5)
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

state board english medium chemistry metallurgy Important finding wrong statement questions in chemistry - by Mohan Raj - Jun 27, 2019 - View & Read

1)
About "Electrolytic refining"
a) The crude metal is refined by electrolysis.
b) The rods of impure metal are used as cathode.
c) Thin strips of pure metal are used as cathode.
d) Less electropositive impurities removed as anode mud.
2)
About "Van-Arkel''
a) Van-Arkel method used for refining Zirconium.
b) Aluminium is a bad conductor of heat.
c) Aluminium shows high resistance to corrosion.
d) Aluminium is a good conductor of heat
3)
a) Aluminium is used to produce die-castings
b) Gold nanopartides used as an catalysts
c) Copper is the first metal used by the human
d) Brass is an alloy of zinc and copper
4)
a) Germanium is used as an semi conductor
b) Stainless steel is an important alloy of Aluminum
c) Zinc sulphide is used in making luminous paints.
d) Brass an alloy of zinc is used in water valves
5)
a) Metallic oxides can be reduced by an alumino thermic process.
b) Flux + gangue \(\rightarrow\) slag
c) Silica gangue present in the ore is basic in nature
d) Cu₂S + FeS \(\rightarrow\) Copper matter

creative two marks questions in +2 chemistry english medium state board chapter one - by Mohan Raj - Jun 27, 2019 - View & Read

1)
What is metallurgy?
2)
Why should we have a ecofriendly metallurgical process?
3)
Name some elements that occur as native elements.
4)
What is meant by concentration?
5)
Can the same method of extraction be used for all metals.

Creative assertion and reason questions chemistry chapter one english medium twelfth standard - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Assertion: Aluminium is used in the design of chemical reactors, medical equipments, refrigeration units and gas pipelines.
Reason: Aluminium shows high resistance to corrosion
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A)
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false
d) Both (A) and (R) are false.
2)
Assertion: Metallic zinc is used in galvanising metals such as iron and steel.
Reason: Zinc is also used to produce die castings
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false.
d) Both (A) and (R) are false.
3)
Assertion: Zone refining is carried out in an inert gas atmosphere
Reason: The metal is treated with a suitable reagent which can form a volatile compound with the metal.
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false.
d) Both (A) and (R) are false
4)
Assertion: Cuprite is concentrated by froth flotation process.
Reason: Cuprite is the sulphide ore
Codes:
a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
c) Assertion is true, but reason is false.
d) Both assertion and reason are false
5)
Assertion: Calamine and Dolomite are the Carbonate ores.
Reason: Calamine is ZnCO₃ whereas dolomite is MgCO₃.ZnCO₃.
Codes:
a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
c) Assertion is true, but reason is false.
d) Both assertion and reason are false

English medium twelfth standard most important one mark questions chemistry chapter one metallurgy - by Mohan Raj - Jun 27, 2019 - View & Read

1)
\(\Delta { G }^{ o }\) vs T plot in the Ellingham's diagram slopes downward the reaction ________.
2)
Pick out the alloy that contains a non-metal as a constituent in it ________.
3)
Ignition mixture used in aluminothermite process is ________.
4)
Malachite has______ composition.
5)
Zinc blende is_______.

twelfth standard chemistry Chapter one multiple choice creative questions - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
2)
Which of the following is not a mineral of aluminium?
3)
Which of the following is commonly used to produce foam in froth floatation process?
4)
Among the following, one does not belong to calcination, Pick the odd one out.
5)
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

mostly asked multiple choice questions in twelfth standard chemistry metallurgy - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

2)

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

3)
Wolframite ore is separated from tinstone by the process of________.
4)
Which one of the following is not feasible
5)
Electrochemical process is used to extract_______.

Chemistry twelfth standard english medium chapter one important one mark questions - by Mohan Raj - Jun 27, 2019 - View & Read

1)
Bauxite has the composition ______.
2)
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
3)
Which one of the following reaction represents calcinations?
4)
The metal oxide which cannot be reduced to metal by carbon is ________.
5)
Which of the metal is extracted by Hall-Heroult process?

Electrolyte	KCl	KNO₃	HCl	NaOAC	NaCl
Λ_- (Scm² mol^-1)	149.9	145.0	426.2	91.0	126.5

a	V₂O₅	i	High density polyethylene
b	Ziegler – Natta	ii	PAN
c	Peroxide	iii	NH₃
d	Finely divided Fe	iv	H₂SO₄

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