### Tamilnadu Board Chemistry Question papers for 12th Standard (English Medium) Question paper & Study Materials

#### 12th standard chemistry - Metallurgy model question paper - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - 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 (NEET-2017)

• 4)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

• 5)

Which of the following is used for concentrating ore in metallurgy?

#### 12th standard chemistry - Metallurgy five marks important questions: - by Chemistry English Medium - New syllabus 2019 - Feb 04, 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)

Give the limitations of Ellingham diagram

• 4)

Write a short note on electrochemical principles of metallurgy.

• 5)

Explain froth flotation, with diagram.

#### 12th chemistry - Metallurgy three marks important questions - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) 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 chemistry - Metallurgy two marks important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone 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 - Metallurgy one marks important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 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 metal is extracted by Hall-Heroult process?

• 3)

Flux is a substance which is used to convert

• 4)

Cupellation is a process used for the refining of

• 5)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

#### 12th chemistry - Metallurgy important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - 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 chemistry - Metallurgy five marks important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - 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.

#### 12th chemistry - Metallurgy three marks important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) 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 chemistry - Metallurgy two marks important question - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone 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 - Metallurgy one marks important questions - by Chemistry English Medium - New syllabus 2019 - Feb 04, 2020 - 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 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 antiphyretic

• 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 C4H3NO2 give their IUPAC names

• 2)

There are two isomers with the formula  CH3NO2. How will you distinguish between them?

• 3)

What happends when
i. 2 – Nitropropane boiled with HCl
ii. Nitrobenezenelectrolytic 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) ${ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i)\quad NaN{ O }_{ 2 }/HCL }{ \underset { ii){ \quad H }_{ 2 }O }{ \longrightarrow } }$

#### 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(C). Compound (C) on reduction with gives (D). Identify (A), (B), (C) and D. Write the equations.

• 3)

Identify X and Y.
${ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MBgr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y$

• 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 CO2 followed by acidification gives(C). Identify A) Band 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 bayers reagent

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

• 1)

Give two important characteristics of physiscorption

• 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 Lowery – 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) HPO2-+ SO32- $\rightleftharpoons$ PO43-+HSO3-
iii) NH4+ CO32-  $\rightleftharpoons$ 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 tetramminecopper (II) complex, ${ [Cu({ H }_{ 2 }O)] }_{ (aq) }^{ 2+ }\rightleftharpoons 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }$ 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
i) Na2[Ni(EDTA)]
II) [Ag(CN)2)
iii) [Co9en)3]2(SO4)3
iv)[Co(ONO)(NH3)5]2+
v)[Pt(NH3)2Cl(NO2)]

• 2)

Write the formula for the following coordination compounds.
a) potassiumhexacyanidoferrate(II)
b) petacarbonyliron(0)
c) pentaamminenitrito −k−N-cobalt(III)ion
d) hexaamminecobalt(III)sulphate
e) sodiumtetrafluoridodihydroxidochromate(III)

• 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 3d series elements.

• 3)

What are inner transition elements?

• 4)

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

• 5)

What are actinides? Give three example

#### 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 is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone 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+ 2is 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 convertedI into the oxide of metal of interest. Gtve 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 Limestone 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 3d series elements.

#### 12th Chemistry - Public Model Question Paper 2019 - 2020 - by Saroja - Vellore - 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 (NEET)

• 3)

Thr 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 MSOCl. 6HO42.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)

C5HN13 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, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ 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 – - hydrogen atom

• 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 freudlich 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 41minutes 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-Ofuel 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 (Kb for C5H5N= 1.7×10-9) is

• 4)

MY and NY3, are insoluble salts and have the same Ksp 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 = kacetone[]32 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-4 and 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 (NEET)

• 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)

Thr 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 C60 have

• 3)

The basic structural unit of silicates is (NEET)

• 4)

Chemical formula of phosgene is

• 5)

SiO44- 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 (NEET-2017)

• 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 Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 aminobenzaldehyde undergoes benzoin condensation
Reason : The aldehydic (-CHO) group is meta directing

• 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 Saroja - Vellore - 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

• 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 Saroja - Vellore - 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 Saroja - Vellore - Jan 03, 2020 - View & Read

• 1)

Faradays 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 =1.25x10-3cm-1) in the cell and the measured resistance was 800 Ω at 25oC. The cell constant is,

• 4)

Cell equation : A + 2B- $\rightarrow$A2++2B;
A2+ + 2e- $\rightarrow$AEo =+0.34V and log10 K = 15.6 at 300K for cell reactions find Eo for
B1 + e $\rightarrow$

• 5)

Which among the following is the strongest reducing agent?

#### 12th Chemistry - Ionic Equilibrium Model Question Paper - by Saroja - Vellore - 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)

Krepresents

• 5)

pH of buffer depends upon concentration of

#### 12th Chemistry - Chemical Kinetics Model Question Paper - by Saroja - Vellore - 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 (NEET)

• 2)

For a reaction Rate = kacetone[]32 then unit of rate constant and rate of reaction respectively is

• 3)

In a first order reaction $x\longrightarrow y$ 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
$2A+B\longrightarrow C+3D$

 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 Saroja - Vellore - 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 (NA 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 Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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)

Thr 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 Saroja - Vellore - 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 (NEET)

• 4)

Thermodynamically the most stable form of carbon is

• 5)

Chemical formula of phosgene is

#### 12th Chemistry - Metallurgy Model Question Paper - by Saroja - Vellore - 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-Herold process___________act as an, anode.

#### 12th Chemistry - Surface Chemistry Model Question Paper - by Saroja - Vellore - Dec 03, 2019 - View & Read

• 1)

For freudlich 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 Saroja - Vellore - Dec 03, 2019 - View & Read

• 1)

The number of electrons that have a total charge of 9650 coulombs is

• 2)

Faradays 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 Saroja - Vellore - 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 Saroja - Vellore - Dec 03, 2019 - View & Read

• 1)

For a reaction Rate = kacetone[]32 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? (NEET)

• 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 Saroja - Vellore - Dec 03, 2019 - View & Read

• 1)

In a solid atom M occupies ccp lattice and $\left( \cfrac { 1 }{ 3 } \right)$ 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 Saroja - Vellore - 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 Saroja - Vellore - 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 PH 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 Saroja - Vellore - 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 (NEET)

• 3)

In which of the following coordination entities the magnitude of Δ0 will be maximum?

• 4)

How many geometrical isomers are possible for<<EVA035.eps>>?

• 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 Saroja - Vellore - 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 v

• 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 (NEET)

#### 12th Chemistry - Metallurgy Important Questions - by Saroja - Vellore - 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? (NEET-2018)

#### 12th Chemistry Half Yearly Model Question Paper 2019 - by Saroja - Vellore - 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 (NEET)

• 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 Saroja - Vellore - 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 Saroja - Vellore - Nov 04, 2019 - View & Read

• 1)

What will be the product for the following reaction acetylchloride $\\ \\ \overset { (i)CH_{ 3 }MgBr }{ \underset { (ii){ H }_{ 2 }{ O }^{ + } }{ \longrightarrow } } \times \overset { acid{ k }_{ 2 }{ cr }_{ 2 }{ o }_{ 7 } }{ \longrightarrow } A$ Identify X and 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

3,3 – dimethylbutan -2-ol on treatment with conc. H2SO4 to give tetramethyl ethylene as a major product. Suggest a suitable mechanisms

• 4)

Complete the following reactions

ii) $C_6H_5-CHCH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow$

• 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 Saroja - Vellore - 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 Saroja - Vellore - 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 also 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 deposited?

• 3)

The same amount of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and chromium nitrate respectively. If 2.935g 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)

0.1M copper sulphate solution in which copper electrode is dipped at 250C . Calculate the electrode potential of copper. [Given: E0Cu2+|Cu=0.34].

• 5)

For the cell Mg (s) Mg2+(aq)||Ag2+(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 Saroja - Vellore - Nov 04, 2019 - View & Read

• 1)

Solubility product of Ag2 CrO4 4 is $1\times10^{-12}$.What is the solubility of Ag2 CrO4 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 theKsp of CaF2?

• 4)

Ksp of AgCl is $1.8\times10^{-10}$. Calculate molar solubility in 1 M AgNO3

• 5)

A particular saturated solution of silver chromate Ag2 CrO4 has $[Ag^{+}]=5\times10^{-5}$ and $[CrO_{4}]^{2-}=4.4\times10^{-4}M$.What is the value of Ksp for Ag2 CrO4?

#### 12th Chemistry - Hydroxy Compounds and Ethers Three Marks Questions - by Saroja - Vellore - Nov 04, 2019 - View & Read

• 1)

What happens when 1-penyl ethanol is treated with acidified KMnO4.

• 2)

Write the mechanism of acid catalysed dehydration of ethanol to give ethane.

• 3)

How is phenol prepared form
i) chloro benzene
ii) isoprophy benzene

• 4)

Explain Kolbe’s reaction

• 5)

Writes 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 Saroja - Vellore - 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 AS2O3 are mixed?

• 3)

What is the difference between a sol and a gel?

• 4)

Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol.

• 5)

Addition of Alum purifies water. Why?

#### 12th Chemistry - Electro Chemistry Three Marks Questions - by Saroja - Vellore - 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 ozf the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
$\lambda^{0}_{catlon}=248.2\quad S$ cm2 mol-1
$\lambda^{0}_{anlon}=51.8\quad S$ 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) 0.25 M KCl
v) 0.5 M 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 0.25cm-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 Saroja - Vellore - 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$10-3Msolution of Ba(OH)2

#### 12th Chemistry - Carbonyl Compounds Two Marks Questions - by Saroja - Vellore - 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(C). Compound (C) on reduction with gives (D). Identify (A), (B), (C) and D. Write the equations.

• 3)

Identify X and Y.
${ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MBgr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y$

• 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 CO2 followed by acidification gives(C). Identify A) Band C.

#### 12th Chemistry - Hydroxy Compounds and Ethers Two Marks Questions - by Saroja - Vellore - 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 bayers reagent

#### 12th Chemistry - Surface Chemistry Two Marks Question - by Saroja - Vellore - Nov 02, 2019 - View & Read

• 1)

Give two important characteristics of physiscorption

• 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 Saroja - Vellore - 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 Saroja - Vellore - Nov 02, 2019 - View & Read

• 1)

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

• 2)

Discuss the Lowery – 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) HPO2-+ SO32- $\rightleftharpoons$ PO43-+HSO3-
iii) NH4+ CO32-  $\rightleftharpoons$ 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 tetramminecopper (II) complex, ${ [Cu({ H }_{ 2 }O)] }_{ (aq) }^{ 2+ }\rightleftharpoons 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }$ among H2O and NH3 Which is stronger Lewis base.

#### 12th Chemistry - Chemistry In Everyday Life One Mark Questions with Answer - by Saroja - Vellore - 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 Saroja - Vellore - 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)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) 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. (AIIMS)
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

#### 12th Chemistry - Organic Nitrogen Compounds One Mark Questions with Answer - by Saroja - Vellore - 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.

• 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 Saroja - Vellore - 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, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ Product ‘X’ will not give

• 5)

${ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'$ is

#### 12th Chemistry - Hydroxy Compounds and Ethers One Mark Questions with Answer - by Saroja - Vellore - 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 Saroja - Vellore - Nov 01, 2019 - View & Read

• 1)

For freudlich 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 0 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

#### 12th Chemistry - Electro Chemistry One Mark Questions with Answer - by Saroja - Vellore - 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 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 Ag2 O (s) + H2O (l) + 2e- →2Ag (s) + 2OH- (aq) Eo.34V 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 Chemistry - Ionic Equilibrium One Mark Questions with Answer - by Saroja - Vellore - 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) 50 ML$\frac{M}{10}$HCL+45ML$\frac{M}{10}$NaOH
3) 75ML$\frac{M}{5}$HCL+40ML$\frac{M}{5}$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 4-1)

• 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 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)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) 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 liked 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 - COC H this reaction is known as

• 5)

The product formed by the reaction an aldehyde with a prmary 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, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ Product ‘X’ will not give

• 3)

Benzoic acid $\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } C\quad 'C'\quad is$

• 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 Saroja - Vellore - 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 Saroja - Vellore - Oct 30, 2019 - View & Read

• 1)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) 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. (AIIMS)
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

• 3)

The central dogma of molecular genetics states that the genetic information flows from

• 4)

In a protein, various amino acids liked together by

• 5)

In aqueous solution of amino acids mostly exists in,

#### 12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Saroja - Vellore - 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

• 4)

The product formed by the reaction an aldehyde with a prmary amine

• 5)

When aniline reacts with acetic anhydride the product formed is

#### 12th Chemistry - Carbonyl Compounds Model Question Paper - by Saroja - Vellore - 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)

${ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'$ is

• 4)

Predict the product Z in the following series of reactions Ethanoic acid $\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous\quad AlcI }{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.$

• 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 Saroja - Vellore - 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 artireeze in automobile rediators?

#### 12th Chemistry - Surface Chemistry Model Question Paper - by Saroja - Vellore - Oct 30, 2019 - View & Read

• 1)

For freudlich 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 Saroja - Vellore - 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 0.1mol 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 followings, which one is the relationship between E1 and E2?

#### 12th Chemistry - Ionic Equilibrium Model Question Paper - by Saroja - Vellore - 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 ( Ksp) 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 (NEET)

• 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 0.1mol 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 freudlich 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 ( Ksp) 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 (NEET)

• 3)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

• 4)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and 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-1mol-1)

#### 12th Standard Chemistry - Solid State Model Question Paper - by Kala - Bodinayakanur - Oct 09, 2019 - View & Read

• 1)

An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

• 2)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 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 oif 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 valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 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 (NEET)

• 5)

In which of the following coordination entities the magnitude of Δ0 will be maximum?

#### 12th Standard Chemistry - Ionic Equilibrium Three Marks Questions - by Saroja - Vellore - 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$10-3Msolution 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 Saroja - Vellore - 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 ozf the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
$\lambda^{0}_{catlon}=248.2\quad S$ cm2 mol-1
$\lambda^{0}_{anlon}=51.8\quad S$ 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) 0.25 M KCl
v) 0.5 M 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 0.25cm-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 Saroja - Vellore - 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 AS2O3 are mixed?

• 3)

What is the difference between a sol and a gel?

• 4)

Why are lyophillic colloidal sols are more stable than lyophobilc 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 becaus

• 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 PH 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 Saroja - Vellore - 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 monomer concentration. Calculate the rate constant.

• 2)

For a reaction x+y+z$\longrightarrow$ productsthe rate law is given by ratek =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 Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 anamolous behaviour of Nitrogen.

#### 12th Chemistry - p - Block Elements - I Three Marks Questions - by Saroja - Vellore - Oct 01, 2019 - View & Read

• 1)

Give the uses of silicones

• 2)

AlCl3 behaves 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) tetragen
(iii) prictogen
(iv) chalcogen

#### 12th Chemistry - Metallurgy Three Marks Questions - by Saroja - Vellore - Oct 01, 2019 - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) 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? (NEET-2018)

• 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 Saroja - Vellore - 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 $\left( 1/3 \right)$ and concentration of [L] is quadrupled.

#### 12th Chemistry Chapter 6 Solid State Two Marks Question - by Saroja - Vellore - 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 Saroja - Vellore - 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)2]+ 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 norms. [Co(en)2 (ONO)CI]CI

#### 12th Chemistry Chapter 4 Transition and Inner Transition Elements Two Marks Question - by Saroja - Vellore - Sep 19, 2019 - View & Read

• 1)

Explain the oxidation states of 3d series elements.

• 2)

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

• 3)

What are actinides? Give three example

• 4)

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

• 5)

Write ionic equation for the reaction between Cr2O7-2 iODS and Fe2+ ions in acidic medium.

#### 12th Chemistry - p - Block Elements - II Two Marks Questions - by Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - Sep 16, 2019 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in 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

• 5)

What is metallurgy?

#### 12th Chemistry - Term 1 Five Mark Model Question Paper - by Saroja - Vellore - 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 Saroja - Vellore - 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 (NEET)

• 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 Saroja - Vellore - 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? (NEET)

• 3)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and 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

• 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 Saroja - Vellore - 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 (NEET)

• 3)

The number of carbon atoms per unit cell of diamond is

• 4)

The composition of a sample of wurtzite is FeO0.931.00 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 Saroja - Vellore - Sep 03, 2019 - View & Read

• 1)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 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<<EVA035.eps>>?

#### 12th Standard Chemistry - p Block Elements - II Book Back Questions - by Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 (NEET)

• 5)

The stability of +1 oxidation state increases in the sequence

#### 12th Standard Chemistry Metallurgy Book Back Questions - by Saroja - Vellore - 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 Saroja - Vellore - 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 Saroja - Vellore - 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 ⟶ XProduct, 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? (NEET)

• 4)

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.

• 5)

For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.

#### 12th Standard Chemistry - Solid State One Mark Question with Answer - by Saroja - Vellore - Aug 28, 2019 - View & Read

• 1)

Graphite and diamond are

• 2)

An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

• 3)

The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA 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 Saroja - Vellore - Aug 27, 2019 - View & Read

• 1)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

• 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 Saroja - Vellore - 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 (NEET)

• 3)

The number of carbon atoms per unit cell of diamond is

• 4)

The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. 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 Saroja - Vellore - Aug 27, 2019 - View & Read

• 1)

Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

• 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 Saroja - Vellore - 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 Saroja - Vellore - Aug 24, 2019 - View & Read

• 1)

An aqueous solution of borax is

• 2)

Boric acid is an acid because its molecule (NEET)

• 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 C60 have

#### 12th Chemistry Chapter 1 Metallurgy One Mark Question Paper - by Saroja - Vellore - 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 Saroja - Vellore - 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 (NEET)

• 3)

The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. 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 Saroja - Vellore - Aug 12, 2019 - View & Read

• 1)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 2)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

• 3)

How many geometrical isomers are possible for<<EVA035.eps>>?

• 4)

Fac-mer isomerism is shown by

• 5)

Choose the correct statement

#### 12th Standard Chemistry Chemical Kinetics Model Question Paper - by Saroja - Vellore - 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 ⟶ XProduct, 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? (NEET)

• 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-1mol-1)

• 5)

In a first order reaction $x\longrightarrow y$ 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 Saroja - Vellore - 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 Saroja - Vellore - 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? (NEET-2018)

• 4)

AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

• 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 Saroja - Vellore - 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 Saroja - Vellore - 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 rd period 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 Saroja - Vellore - Jul 24, 2019 - View & Read

• 1)

An aqueous solution of borax is

• 2)

Boric acid is an acid because its molecule (NEET)

• 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 Saroja - Vellore - 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 refming 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 convertedI into the oxide of metal of interest. Gtve 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 using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) 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)

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)

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 thermitc 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
(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(A) :Metallic zinc is used in galvanising metals such as iron and steel.
Reason (R) :Zinc is also used to produce die castings
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(A) : Zone refining is carried out in an inert gas atmosphere
Reason (R):The metal is treated with a suitable reagent which can form a volatile compound with the metal.
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 floatation process.
Reason :Cuprite is the sulphide ore
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
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?