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Chemistry (Theory) Set 1 2013-2014 ISC (Science) Class 12 Question Paper Solution

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Chemistry (Theory) [Set 1]
Marks: 70Academic Year: 2013-2014
Date: March 2014

PART I
[20]1 | Answer all questions
[5]1.a
[1]1.a.i

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:

(increases, formic acid, decreases, less, zero, small, paired, atoms, unpaired, ions, pentagonal bipyramidal, electrical, more, ethylamine, molecules, propanoic acid, methylamine, chemical)

An electrochemical cell converts ________ energy to _________ energy.

Concept: Concept of Corrosion - Mechanism of Electrochemical Reaction
Chapter: [6.06] Corrosion
[1]1.a.ii

Fill in the blanks by choosing the appropriate word/words from those given in the brackets: 

(increases, formic acid, decreases, less, zero, small, paired, atoms, unpaired, ions, pentagonal bipyramidal, electrical, more, ethylamine, molecules, propanoic acid, methylamine, chemical.)

The crystal of graphite is made-up of ________ while that of sodium chloride is made-up of _______.

Concept: States of Matters: Structure and Properties Solid State - Characteristics of Crystalline Solids;
Chapter: [0.02] States of Matters: Structure and Properties Solid State
[1]1.a.iii

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:

(increases, formic acid, decreases, less, zero, small, paired, atoms, unpaired, ions, pentagonal bipyramidal, electrical, more, ethylamine, molecules, propanoic acid, methylamine, chemical.)

Ethyl isocyanide, on hydrolysis with dilute sulphuric acid, gives ______ and _______.

Concept: Carboxylic Acids - Uses of formic acid and acetic acid
Chapter: [14.01] Carboxylic acids
[1]1.a.iv

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:

(increases, formic acid, decreases, less, zero, small, paired, atoms, unpaired, ions, pentagonal bipyramidal, electrical, more, ethylamine, molecules, propanoic acid, methylamine, chemical.)

The molar conductance of a solution ………… with dilution, while its specific conductance ……….. with dilution.

Concept: Electrochemistry - Electrolytic Conductance
Chapter: [6.04] Electrolytic conductance
[1]1.a.v

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:

(increases, formic acid, decreases, less, zero, small, paired, atoms, unpaired, ions, pentagonal bipyramidal, electrical, more, ethylamine, molecules, propanoic acid, methylamine, chemical.)

The Van’t Hoff factor of the acetic acid solution is _______ than one and the value of a normal colligative property is ________ than the observed colligative property of this solution.

Concept: Relative Molecular Mass of Non-volatile Substances - Van’t Hoff Factor for the Electrolytes Which Dissociate and the Molecules Which Associate in Solution
Chapter: [1.03] Relative molecular mass of non-volatile substances
[5]1.b
[1]1.b.i

Complete the following statement by selecting the correct alternative from the choices given: 

Of the following terms used for denoting the concentration of a solution, the one which does not get affected by temperature is: ______

Molarity

Molality

Normality

Formality

Concept: Normality, Molality - Normality, Molality, Molarity, Mole Fraction, as Measures of Concentration
Chapter: [1.05] Normality, molality
[1]1.b.ii

Complete the following statement by selecting the correct alternative from the choices given: 

The solubility of calcium hydroxide is s mol litre-1. The solubility product under the same condition will be: _________.

4s3

2s3

2s2

s3

Concept: Solubility Product and Its Applications - Solubility product
Chapter: [5.05] Solubility product and its applications
[1]1.b.iii

Complete the following statement by selecting the correct alternative from the choices given: 

A current liberates 0.50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63.5) deposited at the same time by the same current through copper sulphate solution is: ___________

63.5 g

31.8 g

15.9 g

15.5 g

Concept: Occurrence of Metals
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[1]1.b.iv

Complete the following statement by selecting the correct alternative from the choices given: 

Natural rubber is a : _________

Polyester

Polyamide

Polyisoprene

Polysaccharide

Concept: Types of Polymerisation Reactions - Rubber
Chapter: [0.16] Polymers
[1]1.b.v

Complete the following statement by selecting the correct alternative from the choices given: 

Among the following halogens, the one which does not form an oxyacid is _________

Fluorine

Chlorine

Bromine

Iodine

Concept: The Nomenclature of Aliphatic Compounds Containing Halogen Atom - Naming the Halogen Derivatives of Alkanes by Using Common System
Chapter: [11.02] The nomenclature of aliphatic compounds containing halogen atom
[5]1.c
[1]1.c.i

What is the [OH] concentration of an acid whose pH is 5 at 25°C?

Concept: Ionic Equilibria - Multistage Ionization of Acids and Bases with Examples
Chapter: [5.02] Ionic product of water, pH of solutions and pH indicators
[1]1.c.ii

What happens when a nickel rod is dipped into a copper sulphate solution? Justify your answer.

`[E_((Ni^(+2))/(Ni))^0 = -0.25"v" and E  _(("Cu"^(+2))/("Cu"))^0 = +0.34"v"]`

Concept: Occurrence of Metals
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[1]1.c.iii

Write the equation for the preparation of acetanilide from aniline.

Concept: Aniline - Test for Aniline
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
[1]1.c.iv

Define Raoult’s law for the elevation of the boiling point of a solution.

Concept: Vapour Pressure of Liquid Solutions - Vapour Pressure of Liquid- Liquid Solutions
Chapter: [1.01] Raoult's law and colligative properties
[1]1.c.v

An ionic compound is made-up of A cations and B anions. If A cations are present at the alternate comers and B anion is present on the body of the diagonal, what is the formula of the ionic compound?

Concept: Ionic Equilibria - Multistage Ionization of Acids and Bases with Examples
Chapter: [5.02] Ionic product of water, pH of solutions and pH indicators
[5]1.d

Match the following:

(i) Molal depression constant (a) Infinite dilution
(ii) Acetaldehyde (b) mol L-1 sec-1
(iii) Rate of reaction (c) Iodoform
(iv) Optical activity (d) K kg mol-1
(v) Kohlrausch’s law (e) Lactic acid
Concept: Aldehydes and Ketones - Difference Between Formaldehyde and Acetaldehyde
Chapter: [13.01] Carbonyl compounds
Part II Section - A
[50]2 | Answer any two questions
[5]2.a
[3]2.a.i

What will be the vapour pressure of a solution containing 5 moles of sucrose (C12H22O11) in 1 kg of water, if the vapour pressure of pure water is 4.57 mm of Hg? [C = 12, H = 1, O = 16]

Concept: Vapour Pressure of Liquid Solutions - Vapour Pressure of Liquid- Liquid Solutions
Chapter: [1.01] Raoult's law and colligative properties
[2]2.a.ii

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Van’t Hoff factor? What does it signify? [Kb = 0.52 K kg mol-1]

Concept: Relative Molecular Mass of Non-volatile Substances - Van’t Hoff Factor
Chapter: [1.03] Relative molecular mass of non-volatile substances
[4]2.b

(i)

Write the mathematical expression relating to the variation of the rate constant of a reaction with temperature. 
(ii)

How can you graphically find the activation energy of the reaction from the above expression?
(iii)

The slope of the line in the graph of log k (k = rate constant) versus `1/"T"` is -5841. Calculate the activation energy of the reaction.

Concept: Order of a Reaction - Characteristics of First Order Reaction
Chapter: [3.01] Order of a reaction
[1]2.c

Define the Frenkel defect in a solid crystal.

Concept: States of Matters: Structure and Properties Solid State - Characteristics of Crystalline Solids;
Chapter: [0.02] States of Matters: Structure and Properties Solid State
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[10]3
[4]3.a | Explain giving reasons why:
[2]3.a.i

Ionic solids conduct electricity in the molten state, but not in solid-state.

Concept: States of Matters: Structure and Properties Solid State - Characteristics of Crystalline Solids;
Chapter: [0.02] States of Matters: Structure and Properties Solid State
[2]3.a.ii

A solution of sodium chloride has no effect on litmus, but a solution of zinc chloride turns blue litmus red.

Concept: Introduction of Carboxylic Acids
Chapter: [14.01] Carboxylic acids
[2]3.b

In a crystal of diamond: 

(i) How many carbon atoms are present per unit cell?
(ii) What type of lattice does diamond crystallize in?
(iii) How many carbon atoms surround each carbon atom?
(iv) How are they arranged?

Concept: Crystal Lattices and Unit Cells - Introduction
Chapter: [0.02] States of Matters: Structure and Properties Solid State
[4]3.c
[1]3.c.i

What is standard hydrogen electrode?

Concept: Galvanic Cells, Mechanism of Current Production in a Galvanic Cell; - Standard Hydrogen Electrode
Chapter: [6.02] Galvanic cells, mechanism of current production in a galvanic cell;
[3]3.c.ii

0.05 M NaOH solution offered resistance of 31.6 ohms in a conductivity cell at 298 K. If the cell constant of the cell is 0.367 cm-1, calculate the molar conductivity of the NaOH solution.

Concept: Electrolytic Conductance - Relationship Between Conductance and Resistance
Chapter: [6.04] Electrolytic conductance
[10]4
[4]4.a
[3]4.a.i

Kc for the reaction is 61.7 at 60°C. What is its unit? Calculate Kp for the reaction and write its unit.

Concept: Reversible Reactions and Dynamic Equilibrium - Relationship Between Kp and Kc
Chapter: [4.01] Reversible reactions and dynamic equilibrium
[1]4.a.ii

What happens to the equilibrium in a reversible reaction if a catalyst is added to it?

Concept: Chemical Equilibria - Reversible Reactions and Dynamic Equilibrium
Chapter: [4.01] Reversible reactions and dynamic equilibrium
[2]4.b

State the effect of the following on the reaction

\[\ce{2SO2_{(g)} + O2_{(g)} ⇌ 2SO3_{(g)} + 189.4}\]kJ at equilibrium:

(i) Temperature is increased.
(ii) The concentration of SO2 is increased.
(iii) The pressure is decreased.
(iv) Helium is added at constant pressure.

Concept: Le Chatelier’S Principle and Its Applications to Chemical Equilibria - Change of Temperature
Chapter: [4.02] Le Chatelier’s Principle and its applications to chemical equilibria
[4]4.c
[3]4.c.i

0.3605 g of a metal is deposited on the electrode bypassing 1.2 amperes of current for 15 minutes through its salt solution. The atomic weight of the metal is 96. What is the valency of the metal?

Concept: States of Matters: Structure and Properties Solid State - Relation Between Radius, Edge Length and Nearest Neighbour Distance of Atoms in a Unit Cell
Chapter: [0.02] States of Matters: Structure and Properties Solid State
[1]4.c.ii

Explain why phenolphthalein is used as an indicator of acid-base titration.

Concept: Use in Redox Titration
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
Section B
[5]5 | Answer any two questions
[2]5.a
[1]5.a.i

Write the formula of the following compound: 

Triamminetriaquachromium(III)chloride

Concept: Polyhalogen Compounds
Chapter: [11.04] Chlorobenzene
[1]5.a.ii

Write the formula of the following compound:

Potassiumhexacyanoferrate(III)

Concept: Polyhalogen Compounds
Chapter: [11.04] Chlorobenzene
[2]5.b
[1]5.b.i

Name the type of isomerism shown by the following pair of compound:

[CoCl (H2O)](NH3)4Cl2 and [CoCl2(NH3)4] ClH2O

Concept: Isomerism in Coordination Compounds - Stereoisomerism
Chapter: [0.07] Coordination Compounds
[1]5.b.ii

Name the type of isomerism shown by the following pair of compound: 

[Pt(NH3)4] [PtCl6] and [Pt(NH3)4Cl2] [PtCl4]

Concept: Stability of Coordination Compounds
Chapter: [0.07] Coordination Compounds
[1]5.c

For the complexion of [Co(NH3)6]3+
(i) State the hybridisation of the complex.
(ii) State the magnetic nature of the complex.

Concept: Coordination Compounds - Concept of Complexes
Chapter: [0.07] Coordination Compounds
[5]6
[3]6.a
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[1]6.a.i

Write a balanced chemical equation for the following reaction:

Ozone and lead sulphide.

Concept: P - Block Group 16 Elements - Ozone
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18 [0.09] Preparation/ Manufacture, Properties and Uses of Compounds of Groups 16, 17, – Ozone, Sulphur Dioxide, Sulphuric Acid, Hydrochloric Acid
[1]6.a.ii

Write a balanced chemical equation for the following reaction:

Chlorine is passed through hot concentrated NaOH solution.

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18
[1]6.a.iii

Write a balanced chemical equation for the following reaction:

Sulphuric acid is treated with phosphorous.

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18 [0.09] Preparation/ Manufacture, Properties and Uses of Compounds of Groups 16, 17, – Ozone, Sulphur Dioxide, Sulphuric Acid, Hydrochloric Acid
[2]6.b
[1]6.b.i

 Give a reason for the following:

Zn+2 salts are white but Cu2+ salts are blue in colour.

Concept: Acids, Bases and Salts - Arrhenius, BroNsted-lowry and Lewis Concept of Acids and Bases
Chapter: [5.01] Arrhenius, Brönsted-Lowry and Lewis concept of acids and bases
[1]6.b.ii

 Give a reason for the following:

Fluorine gives only one oxide but chlorine gives a series of oxides.

Concept: Concept of Group 16 Elements
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18
[5]7
[3]7.a

How is potassium dichromate prepared from a sample of chromite ore? Give balanced equations for the chemical reactions involved.

Concept: Potassium Dichromate
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[2]7.b

For the molecule IF:

(i) Draw the structure of the molecule.

(ii) State the hybridisation of the central atom.

(iii) State the geometry of the molecule.

Concept: Hybridization, Shape and Structure of Compounds
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18
Section C
[10]8 | Answer any two questions.
[7]8.a

How can the following conversions be brought about:

(i) Acetic acid to methyl cyanide.
(ii) Acetaldehyde to formaldehyde. 
(iii) Nitrobenzene to 2, 4, 6 tribromoaniline.

Concept: Introduction of Carboxylic Acids
Chapter: [14.01] Carboxylic acids
[3]8.b

Identify the reagents A, B, C, D, E and F required for the following conversion:

\[\ce{C6H5NO2->[A]C6H5NH2->[B]C6H5N2+Cl- ->[C]C6H5Cl->[D]C6H5OH->[H2SO4]E + F}\]

Concept: Introduction of Carboxylic Acids
Chapter: [14.01] Carboxylic acids
[10]9
[2]9.a

The deficiency of which vitamin will cause the following diseases: 
(i) Scurvy
(ii) Haemorrhages

Concept: Vitamins - Vitamin Deficiency Diseases
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
[3]9.b

Give one chemical test to distinguish between the following pairs of compounds:

(i) Ethanol and 2 propanols.
(ii) Aniline and ethylamine.

Concept: Acid Derivatives - Laboratory Preparation of Acid Derivatives
Chapter: [14.02] Acid derivatives
[1]9.c

Write the structures of all enantiomers possible for lactic acid.

Concept: Introduction of Carbohydrates
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
[4]9.d

Give balanced equations for the following reactions: 

(i) Acetaldehyde is heated with hydroiodic acid in the presence of red phosphorous.
(ii) Calcium acetate is subjected to dry distillation.
(iii) Sodium ethoxide is treated with ethyl bromide.
(iv) Benzaldehyde is treated with sodium bisulphite.

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [13.01] Carbonyl compounds
[10]10
[3]10.a

An organic compound A with the molecular formula C7H8 on oxidation by chromyl chloride in the presence of CCl4 gives a compound B which gives positive tollen’s test. The compound B on treatment with NaOH followed by acid hydrolysis gives two products C and D. C on oxidation gives B which on further oxidation gives D. The compound D on distillation with soda-lime gives a hydrocarbon E. Below 60°C, concentrated nitric acid reacts with E in the presence of concentrated sulphuric acid forming a compound F. Identify the compounds A, B, C, D, E, and F.

Concept: Acid Derivatives - Formation of Acid Derivatives
Chapter: [14.01] Carboxylic acids [14.02] Acid derivatives
[3]10.b
[1]10.b.i

Give a balanced equation for the following name reaction:

Clemmensen’s reduction.

Concept: Aldehydes and Ketones - Reduction to Alcohol and Alkanes
Chapter: [13.01] Carbonyl compounds
[1]10.b.ii

Give a balanced equation for the following name reaction: 

Kolbe’s electrolytic reaction.

Concept: Carboxylic Acids - Decarboxylation
Chapter: [14.01] Carboxylic acids [14.01] Carboxylic acids
[1]10.b.iii

Give a balanced equation for the following name reaction:

 Balz-Schiemann’s reaction

Concept: Aniline - Gattermann Reaction and Balz – Scheimann Reaction
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
[2]10.c
[1]10.c.i

What do you observe when glucose is treated with bromine water?

Concept: Carbohydrates - Structures of Glucose
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
[1]10.c.ii

What is the isoelectric point?

Concept: Proteins - Isoelectric Point
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
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[2]10.d

Answer the following: 
(i) What is biuret test?
(ii) Write a balanced equation for the formation of biuret.

Concept: Acid Derivatives - Urea -biuret Reaction (Test)
Chapter: [14.02] Acid derivatives
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CISCE previous year question papers Class 12 Chemistry (Theory) with solutions 2013 - 2014

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