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# Question Paper Solutions for Chemistry All India Set 2 2014-2015 CBSE (Science) Class 12

#### Alternate Sets

Marks: 70
[1]1

Account for the following:

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

Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)
[1]2

Which would undergo SN1 reaction faster in the following pair and why?

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

How much charge is required for the reduction of 1 mol of Zn2+ to Zn?

Chapter: [3] Electrochemistry
Concept: Nernst Equation - Introduction
[1]4

Write the dispersed phase and dispersion medium of butter.

Chapter: [5] Surface Chemistry
Concept: Catalysis - Enzyme Catalysis
[1]5

Write the IUPAC name of the given compound:

Chapter: [11] Alcohols, Phenols and Ethers
Concept: Alcohols, Phenols and Ethers - Nomenclature
[2]6
[1]6.1

Write the structures of the following molecules: H2SO3

Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
[1]6.2

Write the structures of the following molecules: XeOF4

Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
[2]7 | attempt any one of the following
[1]7.1

Write down the IUPAC name of the complex [Pt(en)2Cl2]2+. What type of isomerism is shown by this complex?

Chapter: [9] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
[1]7.2

Using IUPAC norms write the formulate for the following coordination compounds : Hexaamminecobalt (III) chloride

Chapter: [9] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities

Using IUPAC norms write the formulate for the following coordination compounds :

Potassium tetrachloridonickelate (II)

Chapter: [9] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
[2]8

Write two factors that affect the rate of reaction.

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

What is rate of reaction?

Chapter: [4] Chemical Kinetics
Concept: Rate of a Chemical Reaction
[2]9
[1]9.1

Arrange the following in increasing order of their basic strength :

C6H5 – NH2, C6H5 – CH2 – NH2, C6H5 – NH – CH3

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Physical Properties of Amines
[1]9.2

Arrange the following in increasing order of their basic strength :

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Physical Properties of Amines
[2]10

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?

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

Why is elevation of boiling point a colligative property?

Chapter: [2] Solutions
Concept: Colligative Properties and Determination of Molar Mass - Elevation of Boiling Point
[3]11
[1]11.1

What is the principle behind the zone refining of metals?

Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining
[1]11.2

What is the role of silica in the extraction of copper?

Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals
[1]11.3

How is 'cast iron' different from 'pig iron'?

Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Application of Thermodynamic Principles of Metallurgy
[3]12
[1]12.1

Account for the following:

N2 is less reactive at room temperature.

Chapter: [7] P - Block Elements
Concept: Concept of Group 15 Elements
[1]12.2

Give reasons for the following : H2Te is the strongest reducing agent amongst all the hydrides of Group 16 elements.

Chapter: [7] P - Block Elements
Concept: Concept of Group 16 Elements
[1]12.3

Account for the following:

Helium is used in diving apparatus.

Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
[3]13
[1]13.1

Write the hybridization and shape of the following complexe : [CoF6]3–

(Atomic number : Co = 27, Ni = 28)

Chapter: [9] Coordination Compounds
Concept: Bonding in Coordination Compounds - Magnetic Properties of Coordination Compounds
[1]13.2

Write the hybridization and shape of the following complexe : [Ni(CN)4]2–

(Atomic number : Co = 27, Ni = 28)

Chapter: [9] Coordination Compounds
Concept: Bonding in Coordination Compounds - Magnetic Properties of Coordination Compounds
[1]13.3

Out of NH3 and CO, which ligand forms a more stable complex with a transition metal and why?

Chapter: [9] Coordination Compounds
Concept: Stability of Coordination Compounds
[3]14 | attempt any one of the following
[3]14.1
[1]14.1.1

How do you convert the following: C6H5CONH2 to C6H5NH2

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines - Preparation of Amines
[1]14.1.2

How do you convert the following : Aniline to phenol

Chapter: [11] Alcohols, Phenols and Ethers
Concept: Preparation of Phenols from Haloarenes, Benzenesulphonic Acid, Diazonium Salts and Cumene
[1]14.1.3

How do you convert the following: Ethanenitrile to ethanamine

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines - Preparation of Amines
[3]14.2
[1]14.2.1

Write the chemical equations involved when aniline is treated with the following reagents:

Br2 water

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines - Chemical Reactions of Amines - Electrophilic Substitution
[1]14.2.2

Write the chemical equations involved when aniline is treated with the following reagents:

CHCI3 + KOH

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines - Chemical Reactions of Amines - Carbylamine Reaction
[1]14.2.3

Write the chemical equations involved when aniline is treated with the following reagents: HCI

Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines - Chemical Reactions of Amines - Basic Character of Amines
[3]15
[1]15.1

Write the names and structure of the monomers of the following polymers: Buna − S

Chapter: [15] Polymers
Concept: Introduction of Polymers
[1]15.2

Write the names and structures of the monomers of the following polymers: Glyptal

Chapter: [15] Polymers
Concept: Introduction of Polymers
[1]15.3

Write the names and structures of the monomers of the following polymers: Polyvinyl chloride

Chapter: [15] Polymers
Concept: Polymers - Classification of Polymers Based on Structure
[3]16
[1]16.1

Write the product obtained when D-glucose reacts with H2N − OH.

Chapter: [14] Biomolecules
Concept: Carbohydrates - Monosaccahrides
[1]16.2

Amino acids show amphoteric behaviour. Why?

Chapter: [14] Biomolecules
Concept: Proteins - Amino Acids
[1]16.3

Why Vitamin C cannot be stored in our body ?

Chapter: [14] Biomolecules
Concept: Vitamins - Classification of Vitamins
[3]17

Calculate the freezing point of the solution when 31 g of ethylene glycol (C2H6O2) is dissolved in 500 g of water.

(Kf for water = 1.86 K kg mol–1)

Chapter: [2] Solutions
Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
[3]18
[1]18.1

Define the following term: Primitive unit cells

Chapter: [1] Solid State
Concept: Crystal Lattices and Unit Cells - Introduction
[1]18.2

Define the following term

Schottky defect

Chapter: [1] Solid State
Concept: Imperfections in Solids - Introduction
[1]18.3

What is ferromagnetism?

Chapter: [1] Solid State
Concept: Magnetic Properties
[3]19
[1]19.1

Write the structure of the major product in each of the following reaction :

Chapter: [10] Haloalkanes and Haloarenes
Concept: Methods of Preparation of Haloalkanes and Haloarenes
[1]19.2

Write the structure of the major product in each of the following reaction :

Chapter: [10] Haloalkanes and Haloarenes
Concept: Methods of Preparation of Haloalkanes and Haloarenes
[1]19.3

Write the structure of the major product in each of the following reaction :

Chapter: [10] Haloalkanes and Haloarenes
Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
[3]20
[1]20.1

Give reasons for the following : Phenol is more acidic than ethanol.

Chapter: [11] Alcohols, Phenols and Ethers
Concept: Physical and Chemical Properties of Alcohols and Phenols
[1]20.2

Give reasons for the following : Boiling point of ethanol is higher in comparison to methoxymethane.

Chapter: [11] Alcohols, Phenols and Ethers
Concept: Physical and Chemical Properties of Alcohols and Phenols
[1]20.3

Give reasons for the following:

(CH3)3C–O–CH3 on reaction with HI gives (CH3)3C–I and CH3–OH as the main products and not (CH3)3C–OH and CH3–I.

Chapter: [10] Haloalkanes and Haloarenes
Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
[3]21

The rate constant of a first order reaction increases from 2 × 10−2 to 4 × 10−2 when the temperature changes from 300 K to 310 K. Calculate the energy of activation (Ea).

(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

Chapter: [4] Chemical Kinetics
Concept: Temperature Dependence of the Rate of a Reaction
[3]22
[1]22.1

Define the following term : Brownian movement

Chapter: [5] Surface Chemistry
Concept: Properties of Colloidal Solutions
[1]22.2

Define the following term :

Peptization

Chapter: [14] Biomolecules
Concept: Proteins - Peptide
[1]22.3

Define the following term : Multimolecular colloids

Chapter: [5] Surface Chemistry
Concept: Classification of Colloids - Classification Based on Nature of Interaction Between Dispersed Phase and Dispersion Medium
[4]23

Seeing the growing cases of diabetes and depression among young children, Mr Lugani, the principal of one reputed school, organised a seminar in which he invites parents and principals. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the health survey in most of the school and discovered a tremendous improvement in the health of the students

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

(iii) What are antidepressant drugs? Give an example.

(iv) Name the sweetening agent used in the preparation of sweets for a diabetic patient.

Chapter: [16] Chemistry in Everyday Life
Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
[5]24 | attempt any one of the following
[5]24.1
[5]24.1.1

Calculate e.m.f. and ∆G for the following cell:

Mg (s) |Mg2+ (0.001M) || Cu2+ (0.0001M) | Cu (s)

"Given :" E_((Mg^(2+)"/"Mg))^0=−2.37 V, E_((Cu^(2+)"/"Cu))^0=+0.34 V.

Chapter: [3] Electrochemistry
Concept: Galvanic Cells - Introduction
[5]24.2
[3]24.2.1

The conductivity of 0.20 mol L−1 solution of KCl is 2.48 × 10−2 S cm−1. Calculate its molar conductivity and degree of dissociation (α). Given λ0 (K+) = 73.5 S cm2 mol−1 and λ0 (C1) = 76.5 S cm2 mol−1.

Chapter: [3] Electrochemistry
Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
[2]24.2.2

What type of battery is mercury cell? Why is it more advantageous than dry cell?

Chapter: [3] Electrochemistry
Concept: Batteries - Primary Batteries
[5]25 | Attempt any one of the following
[5]25.1
[1]25.1.1

Account for the following :

Zr and Hf have almost similar atomic radii.

Chapter: [8] "D" and "F" Block Elements
Concept: F-block Elements - The Lanthanoids
[1]25.1.2

Give reasons: Transition metals show variable oxidation states.

Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)
[1]25.1.3

Account for the following : Cu+ ion is unstable in aqueous solution.

Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)
[1]25.1.4

Complete the following equations : 2 MnO2 + 4 KOH + O2 →

Chapter: [8] "D" and "F" Block Elements
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
[1]25.1.5

Complete the following equations : 2 Na2CrO4 + 2 H + →​

Chapter: [8] "D" and "F" Block Elements
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
[5]25.2
[3]25.2.1
 E_((M^(2+)/M) Cr Mn Fe Co Ni Cu -0.91 -1.18 -0.44 -0.28 -0.25 -0.34

From the given data of E0 values, answer the following questions :

(1) Why is E_(((Cu^(2+))/(Cu))) value exceptionally positive

(2) Why is E_(((Mn^(2+))/(Mn))) value is highly negative as compared to other elements

(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.

Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)
[2]25.2.2

Why do actinoids show a wide range of oxidation states?

Chapter: [8] "D" and "F" Block Elements
Concept: F-block Elements - The Actinoids

Write on similarity between the chemistry of lanthanoids and actinoids.

Chapter: [8] "D" and "F" Block Elements
Concept: F-block Elements - The Actinoids
[5]26 | attempt any one of the following
[5]26.1
[2]26.1.1

A compound 'A' of molecular formula C2H3OCl undergoes a series of reactions as shown below. Write the structures of A, B, C and D in the following reactions :

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Reactions Due to A-hydrogen
[1]26.1.2

Distinguish between:

C6H5-COCH3 and C6H5-CHO

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation
[1]26.1.3

Distinguish between the following : Benzoic acid and methyl benzoate

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond
[1]26.1.4

Write the structure of 2-methylbutanal.

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Nomenclature
[5]26.2
[1]26.2.1

Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagent :

Zn − Hg/conc. HCl

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Reduction
[1]26.2.2

Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagent :

H2N − NHCONH2/H+

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
[1]26.2.3

Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagents :

CH3MgBr and then H3O+

Chapter: [11] Alcohols, Phenols and Ethers
Concept: Preparation of Alcohols from Alkenes, Carbonyl Compounds and Grignard Reagents
[1]26.2.4

Arrange the following in the increasing order of their boiling points : C2H5OH, CH3 − CHO, CH3 − COOH

Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones - Nature of Carbonyl Group
[1]26.2.5

Give a simple chemical test to distinguish between the following pair of compounds :

CH3CH2CHO and CH3CH2COCH3

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