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Chemistry Delhi Set 3 2015-2016 CBSE (Arts) Class 12 Question Paper Solution

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Chemistry
Delhi Set 3
2015-2016 March
Marks: 70

[1]1

What type of magnetism is shown by a substance if magnetic moments of domains are arranged in same direction?

Concept: Magnetic Properties
Chapter: [1] Solid State
[1]2

Out of , which is more reactive towards SN1 reaction and why?

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

On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved, which forms a blue-coloured complex with Cu2+ ion. Identify the gas.

Concept: Bonding in Coordination Compounds - Colour in Coordination Compounds
Chapter: [9] Coordination Compounds
[1]4

What is the reason for the stability of colloidal sols?

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

Write the IUPAC name of the given compound:

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[2]6

When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write

(i) Structural formula of the complex.

(ii) IUPAC name of the complex.

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[2]7

From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell

Answer the following:

(i) Which cell is used in hearing aids?

(ii) Which cell was used in Apollo Space Programme?

(iii) Which cell is used in automobiles and inverters?

(iv) Which cell does not have long life?

Concept: Batteries - Primary Batteries
Chapter: [3] Electrochemistry
[2]8 | Attempt any ONE
[1]8.1

When chromite ore FeCr2O4 is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).

(i) Write the formulae of the compounds (A), (B) and C.

(ii) Write one use of compound (C).

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[1]8.2

Complete the following chemical equation

8MnO4- + 3S2O32- + H2O →

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

Complete the following chemical equation

Cr2O72- + 3Sn2+ + 14H+

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[2]9

Write the mechanism of the following reaction:

Concept: Chemical Reactions of Alcohols and Phenols - Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols
Chapter: [11] Alcohols, Phenols and Ethers
[2]10

For a reaction : 

(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
[3]11

The rate constant for the first-order decomposition of H2O2 is given by the following equation:

`logk=14.2-(1.0xx10^4)/TK`

Calculate Ea for this reaction and rate constant k if its half-life period be 200 minutes.

(Given: R = 8.314 JK–1 mol–1)

Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [4] Chemical Kinetics
[3]12
[1]12.1

Differentiate between adsorbtion and absorption.

Concept: Adsorption - Types of Adsorption
Chapter: [5] Surface Chemistry
[1]12.2

Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?

Concept: Properties of Colloidal Solutions
Chapter: [5] Surface Chemistry
[1]12.3

Out of sulphur sol and proteins, which one form multimolecular colloids?

Concept: Classification of Colloids - Classification Based on Nature of Interaction Between Dispersed Phase and Dispersion Medium
Chapter: [5] Surface Chemistry
[3]13 | Given reasons
[1]13.1

The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[1]13.2

C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[1]13.3

SN1 reactions are accompanied by racemization in optically active alkyl halides.

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[3]14

An element crystallizes in a f.c.c. lattice with cell edge of 250 pm. Calculate the density if 300 g of this element contain 2 × 1024 atoms.

Concept: Calculations Involving Unit Cell Dimensions
Chapter: [1] Solid State
[3]15
[1]15.1

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
[1]15.2

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]15.3

Give reasons: Actinoids show irregularities in their electronic configurations.

Concept: F-block Elements - The Actinoids
Chapter: [8] "D" and "F" Block Elements
[3]16
[1]16.1

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

Concept: Chemical Reaction of Ethers - Cleavege of C-O Bonds
Chapter: [11] Alcohols, Phenols and Ethers
[1]16.2

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

Concept: Preparation of Alcohols from Alkenes, Carbonyl Compounds and Grignard Reagents
Chapter: [11] Alcohols, Phenols and Ethers
[1]16.3

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

Concept: Chemical Reactions of Phenols (Only)
Chapter: [11] Alcohols, Phenols and Ethers
[3]17
[1]17.1

Name the method of refining of metals such as Germanium.

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]17.2

In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]17.3

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

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[3]18

Calculate e.m.f of the following cell at 298 K:

2Cr(s) + 3Fe2+ (0.1M) → 2Cr3+ (0.01M) + 3 Fe(s)

Given: E°(Cr3+ | Cr) = – 0.74 VE° (Fe2+ | Fe) = – 0.44 V

Concept: Galvanic Cells - Introduction
Chapter: [3] Electrochemistry
[3]19
[1]19.1

Write the name of two monosaccharides obtained on hydrolysis of lactose sugar.

Concept: Carbohydrates - Monosaccahrides
Chapter: [14] Biomolecules
[1]19.2

Why Vitamin C cannot be stored in our body ?

Concept: Vitamins - Classification of Vitamins
Chapter: [14] Biomolecules
[1]19.3

What is the difference between a nucleoside and nucleotide ?

Concept: Nucleic Acids - Structure of Nucleic Acids
Chapter: [14] Biomolecules
[3]20

For the complex [Fe(CN)6]3–, write the hybridization type, magnetic character and spin nature 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 active.

Concept: Isomerism in Coordination Compounds - Stereoisomerism
Chapter: [9] Coordination Compounds
[3]21

Write the structures of A, B and C in the following:

Concept: Diazonium Salts - Chemical Reaction of Diazonium Salts - Reactions Involving Displacement of Nitrogen
Chapter: [13] Organic Compounds Containing Nitrogen

Write the structures of A, B and C in the following:

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10] Haloalkanes and Haloarenes
[3]22 | Attempt any ONE
[3]22.1
[1]22.1.1

What is the role of t-butyl peroxide in the polymerization of ethene?

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [15] Polymers
[1]22.1.2

Identify the monomers in the following polymer:

Concept: Introduction of Polymers
Chapter: [15] Polymers
[1]22.1.3

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

Polystyrene, Terylene, Buna-S

Concept: Introduction of Polymers
Chapter: [15] Polymers
[3]22.2

Write the mechanism of free radical polymerization of ethene.

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [15] Polymers
[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, B, C, D and E in the following reactions:

Concept: Chemical Reactions of Phenols (Only)
Chapter: [11] Alcohols, Phenols and Ethers
[5]24.2
[1]24.2.1

Write the chemical equation for the reaction involved in Cannizzaro reaction.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Other Reactions
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]24.2.2

Draw the structure of the semicarbazone of ethanal.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]24.2.3

Why pKa of F-CH2-COOH is lower than that of Cl−CH2−COOH?

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]24.2.4

Write the product in the following reaction:

Concept: Aldehydes and Ketones - Preparation of Aldehydes
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]24.2.5

How can you distinguish between propanal and propanone?

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[5]25 | Attempt any ONE
[5]25.1
[3]25.1.1

Calculate the freezing point of solution when 1.9 g of MgCl2 (M = 95 g mol−1) was dissolved in 50 g of water, assuming MgCl2 undergoes complete ionization.

(Kf for water = 1.86 K kg mol−1)

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [2] Solutions
[2]25.1.2

Out of 1 M glucose and 2 M glucose, which one has a higher boiling point and why?

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

What happens when the external pressure applied becomes more than the osmotic pressure of solution?

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions
[5]25.2
[3]25.2.1

When 2.56 g of sulphur was dissolved in 100 g of CS2, the freezing point lowered by 0.383 K. Calculate the formula of sulphur (Sx).

(Kf for CS2 = 3.83 K kg mol−1, Atomic mass of sulphur = 32 g mol−1]

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [2] Solutions
[2]25.2.2

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing

(i) 1.2% sodium chloride solution?

(ii) 0.4% sodium chloride solution?

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions
[5]26 | Attempt any ONE
[5]26.1
[3]26.1.1
[1]26.1.1.1

Account for the following :

Ozone is thermodynamically unstable.

Concept: P - Block Group 16 Elements - Ozone
Chapter: [7] P - Block Elements
[1]26.1.1.2

Account for the following : Solid PCl5 is ionic in nature.

Concept: P - Block Group 15 Elements - Phosphorus Halides
Chapter: [7] P - Block Elements
[1]26.1.1.3

Account for the following :

Fluorine forms only one oxoacid HOF

Concept: P - Block Group 17 Elements - Oxoacids of Halogens
Chapter: [7] P - Block Elements
[2]26.1.2
[1]26.1.2.1

Draw the structure of BrF5

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [7] P - Block Elements
[1]26.1.2.2

Draw the structures of the following molecules: XeF4

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[5]26.2
[1]26.2.1

Compare the oxidizing action of F2 and Cl2 by considering parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy.

Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
Chapter: [7] P - Block Elements
[2]26.2.2

Write the conditions to maximize the yield of H2SO4 by contact process.

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7] P - Block Elements
[2]26.2.3

Arrange the following in the increasing order of property mentioned :

H3PO3, H3PO4, H3PO2 (Reducing character)

 

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

Arrange the following in the increasing order of property mentioned :

NH3, PH3, AsH3, SbH3, BiH3 (Base strength)

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

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