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Chemistry All India Set 1 2013-2014 CBSE (Science) Class 12 Question Paper Solution

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Chemistry
All India Set 1
2013-2014 March
Marks: 70

[1]1

What is the effect of temperature on chemisorption ?

Concept: Adsorption - Types of Adsorption
Chapter: [5] Surface Chemistry
[1]2

What is the role of zinc metal in the extraction of silver ?

Concept: Oxidation Reduction
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]3

What is the basicity of H3PO3 ?

Concept: P - Block Group 15 Elements - Oxoacids of Phosphorus
Chapter: [7] P - Block Elements
[1]4

Identify the chiral molecule in the following pair :

 

Concept: Haloalkanes - R-s and D-l Configuration
Chapter: [10] Haloalkanes and Haloarenes
[1]5

Which of the following is a natural polymer ? Buna-S, Proteins, PVC

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [15] Polymers
[1]6

The conversion of primary aromatic amines into diazonium salts is known as ___________

Concept: Introduction of Diazonium Salts
Chapter: [13] Organic Compounds Containing Nitrogen
[1]7

What are the products of hydrolysis of sucrose ?

Concept: Carbohydrates - Oligosaccharides
Chapter: [14] Biomolecules
[1]8

Write the structure of p-methylbenzaldehyde.

Concept: Aldehydes and Ketones - Structure of the Carbonyl Group
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[2]9

An element with density 2.8 g cm–3 forms a f.c.c. unit cell with edge length 4 x 10–8 cm. Calculate the molar mass of the element.

(Given : NA = 6.022 x 1023 mol –1)

Concept: Calculations Involving Unit Cell Dimensions
Chapter: [1] Solid State
[2]10
[2]10.1

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?

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

What type of stoichiometric defect is shown by NaCl ?

Concept: Imperfections in Solids - Introduction
Chapter: [1] Solid State
[2]10.2

How will you distinguish between the following pairs of terms: Tetrahedral and octahedral voids

Concept: Close Packed Structures - Formula of a Compound and Number of Voids Filled
Chapter: [1] Solid State

How will you distinguish between the following pairs of terms : Crystal lattice and unit cell

 

Concept: Crystal Lattices and Unit Cells - Introduction
Chapter: [1] Solid State
[2]11

State Kohlrausch law of independent migration of ions. 

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

Why does the conductivity of a solution decrease with dilution ?

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [3] Electrochemistry
[2]12

For a chemical reaction R → P, the variation in the concentration (R) vs. time (t) plot is given as:

(i) Predict the order of the reaction.

(ii) What is the slope of the curve ?

(iii) Write the unit of rate constant for this reaction.

Concept: Factors Influencing Rate of a Reaction
Chapter: [4] Chemical Kinetics
[2]13

Explain the principle of the method of electrolytic refining of metals. Give one example.

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[2]14

Complete the following equations : P4 + H2O →

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

Complete the following equations : XeF4 + O2F2

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]15

Draw the structures of the following molecules: XeF2

 

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

Draw the structures of the following molecules: BrF3

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [7] P - Block Elements
[2]16

Write the equations involved in the following reactions : Reimer – Tiemann reaction

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

Write the equations involved in the following reactions : Williamson synthesis

Concept: Preparation of Ethers from Dehydration of Alcohols and Williamson Systhesis
Chapter: [11] Alcohols, Phenols and Ethers
[2]17

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]18

Write the name of monomers used for getting the following polymers : Bakelite

Concept: Polymers - Classification of Polymers Based on Structure
Chapter: [15] Polymers

Write the name of monomers used for getting the following polymers : Neoprene

Concept: Polymers - Classification of Polymers Based on Molecular Forces
Chapter: [15] Polymers
[3]19

Calculate ΔrG° for the reaction 

Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s)

Given : E°cell = + 2.71 V, 1 F = 96500 C mol–1

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [3] Electrochemistry

Name the type of cell which was used in Apollo space programme for providing electrical power.

Concept: Batteries - Primary Batteries
Chapter: [3] Electrochemistry
[3]20

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :

SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment Time/s–1 Total pressure/atm
1 0 0.4
2 100 0.7

Calculate the rate constant.

(Given : log 4 = 0.6021, log 2 = 0.3010)

Concept: Factors Influencing Rate of a Reaction
Chapter: [4] Chemical Kinetics
[3]21

What are emulsions?

Concept: Emulsions
Chapter: [5] Surface Chemistry

What are their different types emulsions? Give one example of each type.

Concept: Emulsions
Chapter: [5] Surface Chemistry
[3]22

Give reasons for the following : (CH3)3 P = O exists but (CH3)3 N = O does not.

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

Give reasons for the following : Oxygen has less electron gain enthalpy with negative sign than sulphur.

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

Give reasons for the following : H3PO2 is a stronger reducing agent than H3PO3.

 

Concept: P - Block Group 15 Elements - Oxoacids of Phosphorus
Chapter: [7] P - Block Elements
[3]23

Write the IUPAC name of the complex [Cr(NH3)4 Cl2]Cl.

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

What type of isomerism is exhibited by the complex [Co(en)3]3+?

(en = ethane-1,2-diamine)

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

[NiCl4]2− is paramagnetic, while [Ni(CO)4] is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)

Concept: Bonding in Coordination Compounds - Magnetic Properties of Coordination Compounds
Chapter: [9] Coordination Compounds
[3]24

Draw the structures of major monohalo products in each of the following reactions :

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of C-OH Bond
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids

Draw the structures of major monohalo products in each of the following reactions :

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

Which halogen compound in each of the following pairs will react faster in SN2 reaction CH3Br or CH3I

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

Which halogen compound in each of the following pairs will react faster in SN2 reaction

(CH3)3 C – Cl or CH3 – Cl

Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
Chapter: [7] P - Block Elements
[3]25 | Attempt Any One
[3]25.1

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

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
[3]25.2

Give the structures of A, B and C in the following reactions :

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

Give the structures of A, B and C in the following reactions :

Concept: Amines - Preparation of Amines
Chapter: [13] Organic Compounds Containing Nitrogen
[3]26

Define the following terms as related to proteins :

Peptide linkage

Concept: Proteins - Peptide
Chapter: [14] Biomolecules

Define the following terms as related to proteins :

Primary structure

Concept: Proteins - Classification of Amino Acids
Chapter: [14] Biomolecules

Define the following terms as related to proteins:

Denaturation

Concept: Proteins - Denaturation of Proteins
Chapter: [14] Biomolecules
[3]27

On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the
National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.

(i) Write the values shown by

(a) Dr. Satpal

(b) NHRC

(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer ?

(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16] Chemistry in Everyday Life
[5]28 | Attempt Any One
[5]28.1

Define the following terms : Molarity

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

Define the following terms : Molal elevation constant (Kb)

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

A solution containing 15 g urea (molar mass = 60 g mol–1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol–1) in water. Calculate the mass of glucose present in one litre of its solution.

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions
[5]28.2

What type of deviation is shown by a mixture of ethanol and acetone ? Give reason.

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

A solution of glucose (molar mass = 180 g mol–1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution ? (Density of solution = 1.2 g mL–1)

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions
[5]29
[5]29.1

Complete the following equations:Cr2O72- + 2OH

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

Complete the following equations : MnO4- + 4H+ + 3e- →

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

Account for the following :

Zn is not considered as a transition element.

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

How would you account for the following: Transition metals form complex compounds.

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

Account for the following : The E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements
[5]29.2

With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids

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

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

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

Complete the following equation : MnO4- + 8H+ + 5e- →

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

Out of Mn3+ and Cr3+, which is more paramagnetic and why ?

(Atomic nos. : Mn = 25, Cr = 24)

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements
[5]30 | Attempt Any One
[5]30.1

Write the products formed when CH3CHO reacts with the following reagents : HCN

 

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

Write the products formed when CH3CHO reacts with the following reagents : H2N – OH

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

Write the products formed when CH3CHO reacts with the following reagents: CH3CHO in the presence of dilute NaOH

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

Give simple chemical tests to distinguish between the following pairs of compounds:  Benzoic acid and Phenol

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

Give simple chemical tests to distinguish between the following pairs of compounds

Propanal and Propanone

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[5]30.2

Account for the following : Cl – CH2COOH is a stronger acid than CH3COOH.

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Substitution Reactions in the Hydrocarbon Part
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 chemical equations to illustrate the following name reactions : Rosenmund reduction

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

Write the chemical equations to illustrate the following name reactions : Cannizzaro’s reaction

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

Out of CH3CH2 – CO – CH2 – CH3 and CH3CH2 – CH2 – CO – CH3, which gives iodoform test?

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

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