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

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Chemistry [All India Set 2]
Marks: 70Date: 2014-2015 March

[1]1

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
[1]2

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

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

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

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

Write the dispersed phase and dispersion medium of butter.

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

Write the IUPAC name of the given compound:

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

Write the structures of the following molecules: H2SO3

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

Write the structures of the following molecules: XeOF4

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

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

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

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

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

Potassium tetrachloridonickelate (II)

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

Write two factors that affect the rate of reaction.

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

What is rate of reaction?

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

Arrange the following in increasing order of their basic strength :

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

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

Arrange the following in increasing order of their basic strength :

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

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

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

Why is elevation of boiling point a colligative property?

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

What is the principle behind the zone refining of metals?

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

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

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

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

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

Account for the following:

N2 is less reactive at room temperature.

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

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

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

Account for the following:

Helium is used in diving apparatus.

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

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

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

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

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

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

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

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

Concept: Stability of Coordination Compounds
Chapter: [9] 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

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

How do you convert the following : Aniline to phenol

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

How do you convert the following: Ethanenitrile to ethanamine

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

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

Br2 water

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

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

CHCI3 + KOH

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

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

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

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

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

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

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

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

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

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

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

Amino acids show amphoteric behaviour. Why?

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

Why Vitamin C cannot be stored in our body ?

Concept: Vitamins - Classification of Vitamins
Chapter: [14] Biomolecules
[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)

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

Define the following term: Primitive unit cells

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

Define the following term

Schottky defect

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

What is ferromagnetism?

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

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

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

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

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

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

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

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

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

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

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

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

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

Define the following term : Brownian movement

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

Define the following term :

Peptization

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

Define the following term : Multimolecular colloids

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

After reading the above passage, answer the following questions:

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

(ii) As a student, how can you spread awareness about this issue?

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

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

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16] Chemistry in Everyday Life
[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.`

 

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

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

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

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

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

Give reasons: Transition metals show variable oxidation states.

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

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

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

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

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

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

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

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

Why do actinoids show a wide range of oxidation states?

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

Write on similarity between the chemistry of lanthanoids and actinoids.

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

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

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
[1]26.1.3

Distinguish between the following : Benzoic acid and methyl benzoate

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

Write the structure of 2-methylbutanal.

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

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

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

H2N − NHCONH2/H+

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

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

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

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

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

CH3CH2CHO and CH3CH2COCH3

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

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