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Chemistry All India Set 2 C 2015-2016 CBSE (Arts) Class 12 Question Paper Solution

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Chemistry [All India Set 2 C]
Marks: 70Date: 2016-03-09
Duration: 3h

[1]1

Write the IUPAC name of the given compound:

 

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[1]2

Write the structure of an isomer of compound C4H9Br which is most reactive towards SN1 reaction

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[1]3

What is the reason for the stability of colloidal sols?

Concept: Properties of Colloidal Solutions
Chapter: [5] Surface Chemistry
[1]4

Give an example each of a molecular solid and an ionic solid.

Concept: Classification of Crystalline Solids
Chapter: [1] Solid State
[1]5

Pb(NO3)2 on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
Chapter: [7] P - Block Elements
[2]6

For a reaction: 

Rate = k

(i) Write the order and molecularity of this reaction.

(ii) Write the unit of k.

Concept: Factors Influencing Rate of a Reaction
Chapter: [4] Chemical Kinetics
[2]7

Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction

Concept: Amines - Preparation of Amines
Chapter: [13] Organic Compounds Containing Nitrogen

Write the chemical equations involved in the following reactions: Carbylamine reaction

Concept: Amines - Chemical Reactions of Amines - Carbylamine Reaction
Chapter: [13] Organic Compounds Containing Nitrogen
[2]8

Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why

Concept: Solubility - Solubility of a Gas in a Liquid
Chapter: [2] Solutions

In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

Concept: Vapour Pressure of Liquid Solutions - Vapour Pressure of Liquid- Liquid Solutions
Chapter: [2] Solutions
[2]9

When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3moles of AgCl are precipitated per mole of the compound. Write

(i) Structural formula of the complex

Concept: Isomerism in Coordination Compounds - Stereoisomerism
Chapter: [9] Coordination Compounds

When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3moles of AgCl are precipitated per mole of the compound. Write (ii) IUPAC name of the complex

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[2]10 | Attempt Any One
[2]10.1

Draw the structures of the following molecules: BrF3

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [7] P - Block Elements

Draw the structures of the following molecules: XeF4

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]10.2

What happens when: SO2 gas is passed through an aqueous solution Fe+3 salt?

Concept: P - Block Group 16 Elements - Sulphur Dioxide
Chapter: [7] P - Block Elements

What happens when: XeF4 reacts with SbF5?

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[3]11

Write the final product(s) in each of the following reactions:

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloarenes - Nucleophilic Substitution
Chapter: [10] Haloalkanes and Haloarenes

Write the final product(s) in each of the following reactions:

Concept: Chemical Reactions of Alcohols and Phenols - Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols
Chapter: [11] Alcohols, Phenols and Ethers

Write the final product(s) in each of the following reactions:

Concept: Chemical Reactions of Phenols (Only)
Chapter: [11] Alcohols, Phenols and Ethers
[3]12 | Attempt Any One
[3]12.1

How do you convert: Chlorobenzene to biphenyl

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10] Haloalkanes and Haloarenes

How do you convert: Propene to 1-iodopropane

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10] Haloalkanes and Haloarenes

How do you convert: 2-bromobutane to but-2-ene

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Elimination Reactions
Chapter: [10] Haloalkanes and Haloarenes
[3]12.2

Write the major products(s) in the following:

Concept: Diazonium Salts - Importance of Diazonium Salts in Synthesis of Aromatic Compounds
Chapter: [13] Organic Compounds Containing Nitrogen

Write the major products(s) in the following:

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloarenes - Reaction with Metals
Chapter: [10] Haloalkanes and Haloarenes

Write the major products(s) in the following:

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[3]13

Write the structural difference between starch and cellulose.

Concept: Carbohydrates - Polysaccharides
Chapter: [14] Biomolecules

What type of linkage is present in nucleic acids?

Concept: Introduction of Nucleic Acids
Chapter: [14] Biomolecules

Give one example each for fibrous protein and globular protein.

Concept: Introduction of Proteins
Chapter: [14] Biomolecules
[3]14

Name the method used for the refining of Nickel metal.

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements

What is the role of cryolite in the extraction of aluminium?

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements

What is the role of limestone in the extraction of iron from its oxides?

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[3]15

Give reasons: SO2 is reducing while TeO2 is an oxidising agent.

Concept: Concept of Group 16 Elements
Chapter: [7] P - Block Elements

Nitrogen does not form pentahalide.

Concept: Concept of Group 15 Elements
Chapter: [7] P - Block Elements

ICl is more reactive than I2.

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [7] P - Block Elements
[3]16

For the complex [Fe(H2O)6]+3, write the hybridisation, magnetic character and spin of the complex. (At, number : Fe = 26)

Concept: Bonding in Coordination Compounds - Magnetic Properties of Coordination Compounds
Chapter: [9] Coordination Compounds

Draw one of the geometrical isomers of the complex [Pt (en)2Cl2] +2 which is optically inactive

Concept: Isomerism in Coordination Compounds - Stereoisomerism
Chapter: [9] Coordination Compounds
[3]17

An element crystallises in a b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm-3. How many atoms are present in 300 g of the element?

Concept: Number of Atoms in a Unit Cell
Chapter: [1] Solid State
[3]18

What is the role of sulphur in the vulcanisation of rubber?

Concept: Types of Polymerisation Reactions - Rubber
Chapter: [15] Polymers

Identify the monomers in the following polymer:

Concept: Introduction of Polymers
Chapter: [15] Polymers

Arrange the following polymers in the Increasing order of their intermolecular forces:

Terylene, Polythene, Neoprene

Concept: Introduction of Polymers
Chapter: [15] Polymers
[3]19

For the first order thermal decomposition reaction, the following data were obtained:

Time / sec               Totalpressure / atm

0                              0.30

300                          0.50

Calculate the rate constant

(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)

Concept: Factors Influencing Rate of a Reaction
Chapter: [4] Chemical Kinetics
[3]20

Give reasons for the following:

Aniline does not undergo Friedal- Crafts reaction.

Concept: Amines - Chemical Reactions of Amines - Electrophilic Substitution
Chapter: [13] Organic Compounds Containing Nitrogen

Give reasons for the following: (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

Concept: Physical Properties of Amines
Chapter: [13] Organic Compounds Containing Nitrogen

Give reasons for the following: Primary amines have higher boiling point than tertiary amines.

Concept: Physical Properties of Amines
Chapter: [13] Organic Compounds Containing Nitrogen
[3]21

Define the following terms: Lyophilic colloid

Concept: Classification of Colloids - Classification Based on Nature of Interaction Between Dispersed Phase and Dispersion Medium
Chapter: [5] Surface Chemistry

Define the following terms: Zeta potential

Concept: Catalysis - Enzyme Catalysis
Chapter: [5] Surface Chemistry

Define the following terms: Associated colloids

Concept: Properties of Colloidal Solutions
Chapter: [5] Surface Chemistry
[3]22

Calculate the boiling point of solution when 4g of MgSO4 (M= 120 g mol-1) was dissolved in 100g of water, assuming MgSO4 undergoes complete ionization. (Kb for water = 0.52 K kgmol-1)

Concept: Colligative Properties and Determination of Molar Mass - Elevation of Boiling Point
Chapter: [2] Solutions
[4]23

Due to hectic and busy schedule, Mr Angad made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr Deepak, a close friend of Mr. Angad advised him to stop taking sleeping pills and suggested to change his life lifestyle by doing yoga, meditation and some physical exercise. Mr. Angad followed his friend’s advice and after few days he started feeling better.

After reading the above passage, answer the following

(i) What are the values (at least two) displayed by Mr. Deepak?

(ii) Why is it not advisable to take sleeping pills without consulting doctor?

(iii) What are tranquilisers? Give two examples.

Concept: Drugs and Their Classification
Chapter: [16] Chemistry in Everyday Life
[5]24 | Attempt Any One
[5]24.1

Write the structures of A and B in the following reactions:

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Write the structures of A and B in the following reactions

Concept: Carboxylic Acids - Methods of Preparation of Carboxylic Acids
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Distinguish between:

C6H5-COCH3 and C6H5-CHO

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Distinguish between: CH3COOH and HCOOH

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Arrange the following in the increasing order of their boiling points: CH3CHO, CH3COOH, CH3CH2OH

Concept: Physical Properties of Aldehydes and Ketones
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[5]24.2

Write the chemical reaction involved in Wolff-Kishner reduction.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Reduction
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Arrange the following in the increasing order of their reactivity towards nucleophilic addition reaction:

C6H5COCH3, CH3-CHO, CH3COCH3

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Why carboxylic acid does not give reactions of carbonyl group?

Concept: Carboxylic Acids - Structure of the Carboxyl group
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Write the product in the following reaction

Concept: Aldehydes and Ketones - Preparation of Aldehydes
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

A and B are two functional isomers of compound C3H6O.On heating with NaOH and I2, isomer B forms yellow precipitate of iodoform whereas isomer A does not form any precipitate. Write the formulae of A and B.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[5]25 | Attempt Any One
[5]25.1

Calculate E°cell for the following reaction at 298K:

2Al(s) + 3Cu+2(0.01M) → 2Al+3(0.01M) + 3Cu(s)

Given: Ecell = 1.98V

Concept: Galvanic Cells - Introduction
Chapter: [3] Electrochemistry

Using the E° values of A and B, predict which is better for coating the surface of iron [E°(Fe+2/Fe) = -0.44V] to prevent corrosion and why?

Given: E° (A+2/A)=-2.37 V: E°(B+2/B)= -0.14V

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [3] Electrochemistry
[5]25.2

The conductivity of 0.001 mol L-1 solution of CH3COOH is 3.905× 10-5 S cm-1. Calculate its molar conductivity and degree of dissociation (α) Given λ°(H+)= 349.6 S cm2 mol-1 and λ°(CH3COO)= 40.9S cm2mol-1.

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [3] Electrochemistry

Define electrochemical cell

Concept: Batteries - Primary Batteries
Chapter: [3] Electrochemistry

What happens if external potential applied becomes greater than E°cell of electrochemical cell?

Concept: Galvanic Cells - Introduction
Chapter: [3] Electrochemistry
[5]26 | Attempt Any One
[5]26.1

Account for the following:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

Account for the following: Cr+2 is a strong reducing agent

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

Account for the following:

Cu+2 salts are coloured, while Zn+2 salts are white.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

Complete the following equations:

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements

Complete the following equations: Cr2O72- + 14H+ + 6I →

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[5]26.2

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Write the element which shows maximum number of oxidation states. Give reason.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element has the highest m.p?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element shows only +3 oxidation state?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements

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