### 12th Standard Chemistry Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 12 Session 2020 - 2021 TN Stateboard [ Chapter , Marks , Book Back, Creative & Term Based Questions Papers - Syllabus, Study Materials, MCQ's Practice Tests etc..]

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

• 1)

Who do soaps not work in hard water?

• 2)

Name some important categories of food additives.

• 3)

• 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 - 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 - 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 - View & Read

• 1)

What are antibiotics?

• 2)

Name one substance which can act as both analgesic and antiphyretic

• 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 CH3CH2NHwhile 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 - 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 Monoobromoderivative (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 - 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 - View & Read

• 1)

Identify compounds A, B and C in the following sequence of reactions.
i) ${ C }_{ 6 }{ H }_{ 5 }NO_{ 2 }\overset { Fe/HCL }{ \longrightarrow } A\overset { HN{ O }_{ 2 } }{ \underset { 273K }{ \longrightarrow } } B\overset { { C }_{ 6 }{ H }_{ 5 }OH }{ \longrightarrow } C$

• 2)

Write short notes on the following
i. Hofmann’s bromide reaction

• 3)

Account for the following
i. Aniline does not undergo Friedel – Crafts reaction

• 4)

How will you convert diethylamine into
i) N, N – diethylacetamide
ii) N – nitrosodiethylamine

• 5)

Identify A, B and C
$\overset{SoCl_2}\longrightarrow A \overset{NH_3}\longrightarrow B\overset{LiAH_4}\longrightarrow (C)$

#### 12th Standard Chemistry English Medium - Organic Nitrogen Compounds 2 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 - 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

• 4)

How will you convert nitrobenzene into
i. 1,3,5 - trinitrobenzene

• 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 - 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 - 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 - 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) C6HsCHO
(iv) C6H5COO-

#### 12th Standard Chemistry English Medium - Carbonyl Compounds 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 - 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 - 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

• 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 - 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 CO2 followed 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 - View & Read

• 1)

How is propanoic acid is prepared starting from
(a) an alcohol

• 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

• 4)

What is the action of HCN on
(i) propanone

• 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 - 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 - 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, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ 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 - 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. H2SO4 undergoes 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 COBalso 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 - 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. H 2SO4 to 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 - 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 - 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 bayers reagent

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

• 1)

Write the structure of the aldehyde, carboxylic acid and ester that yield 4- methylpent -2-en-1-ol.

• 2)

What is meta metamerism? Give the structure and IUPAC name of metamers of 2-methyoxy propane

• 3)

Complete the following reactions

• 4)

How are the following conversions effected
i) benzylchloride to benzylalcohol
ii) benzyalalcohol to benzoic acid

• 5)

Complete the following reactions
i) CH3- CH2 - OH $\overset { { P}{ Br_3 }{ } }{ \underset { {} }{ \longrightarrow } }$  A  $\overset { { aq.NaOH}{ }{ } }{ \underset { {} }{ \longrightarrow } }$ B $\overset { { Na}{ } }{ \underset { {} }{ \longrightarrow } }$ C
ii) C6H5- OH  $\overset { { Zndert}{ } }{ \underset { {} }{ \longrightarrow } }$ 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 - 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 - 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 - View & Read

• 1)

• 2)

• 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 - View & Read

• 1)

Explain intermediate compound formation theory of catalysis with an example.

• 2)

What is the difference between homogenous and hetrogenous catalysis?

• 3)

#### 12th Standard Chemistry English Medium - Surface Chemistry 3 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 - 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 - 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)

• 5)

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

• 1)

Give two important characteristics of physiscorption

• 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 - 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)

• 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 - 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 - 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 - 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 - 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 - View & Read

• 1)

• 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
$\lambda^{0}_{catlon}=248.2 \ S$ 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 - 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 - 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 - 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 - 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 Eo = -1.18V
Mn2+ ➝ Mn3+ + e- Eo = -1.51V
The Eo 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= 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 ΛoHoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25oC.

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

• 1)

Discuss the Lowery – 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 - 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. Kb 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 - 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 o 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 - 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 - View & Read

• 1)

What are Lewis acids and bases? Give two example for each.

• 2)

Identify the conjugate acid base pair for the following reaction in aqueous solution
i) HS- (aq) + HF $\rightleftharpoons$ F-(aq) + H2S(aq)
ii) HPO2-+ SO32- $\rightleftharpoons$ PO43- + HSO3-
iii) NH4+ CO32-  $\rightleftharpoons$ NH+ 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 tetramminecopper (II) complex,${ [Cu({ H }_{ 2 }O)] }_{ (aq) }^{ 2+ }+ 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }$ 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 - View & Read

• 1)

What is the decreasing order of strength of bases
OH, NH2- H - C ≡ C and CH3 - CH2-

• 2)

Using Gibb’s free energy change, ∆Go=57.34 kJ mol-1, for the reaction, X2Y(s)⇌2X++Y2- (aq), calculate the solubility product of X2Y in water at 300 K (R = 8.3 J K-1Mol-1)

• 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 - 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) 50 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(Ksp) 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 (Ksp) 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 - View & Read

• 1)

For the reaction 2A + B ⟶ A2B. The rate = k [A] [B]2 with k = 2.0 x 10-6 mol? L2 S-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.

#### 12th Standard Chemistry English Medium - Chemical Kinetics 5 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 - 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.

#### 12th Standard Chemistry English Medium - Chemical Kinetics 3 Mark Book Back Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 - 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)

H2(g) + Cl2(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 - 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 - 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 10-4 mol 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 - 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 - 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 - 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 - View & Read

• 1)

Experiment shows that Nickel oxide has the formula Ni0.96.O1.00. 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 - 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 - 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 - 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 - View & Read

• 1)

The number of carbon atoms per unit cell of diamond is

• 2)

The composition of a sample of wurtzite is FeO0.931.00 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 - View & Read

• 1)

Graphite and diamond are

• 2)

An ionic compound Ax By 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 AxBy 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 - 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 - 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 [CoC2O4)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 - 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 - 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 - 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 $\cfrac { \left[ { Ag }^{ + } \right] }{ \left[ Ag\left( NH_{ 3 } \right) _{ 2 } \right] ^{ + } }$ in 0.2 M solution of NH3. If the stability constant for the complex $[Ag(NH_{ 3 })_{ 2 }]^{ \rightarrow }$

• 4)

Write a neutral molecule in which the central atom is Sp3 d2 hybridised.

• 5)

Name the following complex using IUPAC norms. [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 - View & Read

• 1)

Write the formula for the following coordination compounds.
a) potassiumhexacyanidoferrate(II)

• 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 - View & Read

• 1)

Identify the ambidentate ligand among the following.

• 2)

An aqueous solution of (PdCI)2 4NH3, when treated with excess of AgNO3 precipitated 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 - View & Read

• 1)

The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(Ox)]Cl is L

• 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 - 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 - 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) Cr2O72- + 2OH-
(ii) MnO4- + 4H+ + 3e- ⟶

• 5)

What are the general properties of f-block elements? (Lanthanides and Actinides)
(i) Electronic configuration
(ii) Oxidation state

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

• 1)

What are transition metals? Give four examples.

• 2)

What are inner transition elements?

• 3)

Justify the position of lanthanides and actinides in the periodic table.

• 4)

Which is more stable? Fe3+ or Fe2+ - explain.

• 5)

Explain the variation in E0M3+/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 - 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 iODS 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 - View & Read

• 1)

Explain the oxidation states of 4d series elements.

• 2)

What are actinides? Give three example.

• 3)

Describe the preparation of potassium dichromate.

• 4)

What is lanthanide contraction and what are the effects of lanthanide contraction?

• 5)

Complete the following.
a. MnO42- + H+ ⟶?
b. C6H5CH3 $\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } }$?
c. MnO4- + Fe2+ ⟶?
d. KMnO4 $\overset { \triangle }{ \underset { Red\ hot }{ \longrightarrow } }$ ?
e. Cr2O72- + I- + H+ ⟶?
f. Na2Cr2O7 + KCl ⟶?

#### 12th Standard Chemistry English Medium - Transition and Inner Transition Elements 1 Mark Creative Question Paper and Answer Key 2022 - 2023 - by Study Materials - 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 PH 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 - 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 - 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 - 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 - 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 - 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 anamolous 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 - 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 - 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?

### TN Stateboard Education Study Materials

#### 12th Standard Chemistry English Medium Reduced Syllabus 2020 - 2021 - by QB Admin Jan 23, 2021 Jan 23, 2021

Reduced Syllabus and Chapters for 12th Standard Chemistry English Medium

Practical Notes

#### 12th Stateboard Chemistry 2019 - 2020 Academic Monthly Syllabus - by Question Bank Software Aug 02, 2019 Aug 02, 2019

Chemistry 2019 - 2020 Academic Monthly Syllabus

### TN Stateboard Updated Class 12th Chemistry Syllabus

#### Metallurgy

Introduction - Occurrence of metals - Concentration of ores - Extraction of crude metal - Thermodynamic principle of metallurgy - Electrochemical principle of metallurgy - Refining process - Application metals -

#### p - Block Elements - I

Introduction - General trends in properties of p-block elements - Group 13 (Boron group) elements - Group 14 (Carbon group) elements -

#### p - Block Elements - II

Introduction - Group 15 (Nitrogen group) elements - oxygen - Group 17 (Halogen group) elements - Group 18 (Inert gases) elements -

#### Transition and Inner Transition Elements

Introduction - Position of d- block elements in the periodic table - Electronic configuration - General trend in properties - important compound of Transition elements

#### Coordination Chemistry

Introduction - Coordination compounds and double salts - Werner's theory of coordination compounds - Definition of important terms pertaining to co-ordination compounds - Nomenclature of coordination compounds - Isomerism in coordination compounds - Theories of coordination compound

#### Solid State

Introduction - General characteristics of solids - Classification of solids - Classification of crystalline solids - Classification of crystalline solids - Primitive and non-primitive unit cell - Packing in crystals - Imperfection in solids

#### Chemical Kinetics

Introduction - Rate of a chemical reaction - Molecularity - The integrated rate equation - Half-life period of a reaction - Collision theory - Arrhenius equation – The effect of temperature on reaction rate - Factors affecting the reaction rate

#### TN StateboardStudy Material - Sample Question Papers with Solutions for Class 12 Session 2020 - 2021

Latest Sample Question Papers & Study Material for class 12 session 2020 - 2021 for Subjects Maths, Physics, Biology, Computer Science, Business Maths, Economics, Commerce, Accountancy, History, Computer Applications, Computer Technology, English, உயிரியல், கணினி பயன்பாடுகள், கணினி அறிவியல், வணிகக் கணிதம், வணிகவியல், பொருளியல், கணிதவியல், வேதியியல், இயற்பியல், கணினி தொழில்நுட்பம், வரலாறு, கணக்குப்பதிவியல், தமிழ் in PDF form to free download [ available question papers ] for practice. Download QB365 Free Mobile app & get practice question papers.

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