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Chemistry All India Set 3 2016-2017 CBSE (Arts) Class 12 Question Paper Solution

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Chemistry [All India Set 3]
Marks: 70Date: 2017-03-24
Duration: 3h

[1]1

Out of  which is an example of a benzylic halide?

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes
[1]2

What is the effect of adding a catalyst on Activation energy (Ea)

Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [4] Chemical Kinetics

What is the effect of catalyst on: Gibbs energy (∆G)

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [3] Electrochemistry
[1]3

Write the formula of the compound of iodine which is obtained when conc. HNO3 oxidises I2

Concept: P - Block Group 16 Elements - Classification of Oxides
Chapter: [7] P - Block Elements
[1]4

What type of colloid is formed when a gas is dispersed in a liquid? Give an example

Concept: Classification of Colloids - Classification Based on Type of Particles of the Dispersed Phase, Multimolecular, Macromolecular and Associated Colloids
Chapter: [5] Surface Chemistry
[1]5

Write the IUPAC name of the following compound: 

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

Draw the structures of the following molecules: XeF4

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

Draw the structures of the following: BrF5

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

Write the name of the cell which is generally used in transistors. Write the reactions taking place at the anode and the cathode of this cell.

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [3] Electrochemistry
[2]8 | Attempt Any One
[2]8.1

Arrange the following compounds in the increasing order of their acid strength:

p-cresol, p-nitrophenol, phenol

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

Write the mechanism (using curved arrow notation) of the following reaction:

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes
[2]8.2

Write the structures of the products when Butan-2-ol reacts with CrO3

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11] Alcohols, Phenols and Ethers

Write the structures of the products when Butan-2-ol reacts with SOCl2

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11] Alcohols, Phenols and Ethers
[2]9

Using IUPAC norms write the formulae for Potassium trioxalatoaluminate(III)

Concept: Importance and Applications of Coordination Compounds
Chapter: [9] Coordination Compounds

Using IUPAC norms write the formulae for Dichloridobis(ethane-1,2-diamine)cobalt(III)

Concept: Importance and Applications of Coordination Compounds
Chapter: [9] Coordination Compounds
[2]10

Calculate the number of unit cells in 8.1 g of aluminium if it crystallizes in a f.c.c. structure. (Atomic mass of Al = 27 g mol–1)

Concept: Number of Atoms in a Unit Cell
Chapter: [1] Solid State
[3]11

What type of isomerism is shown by the complex [Co(NH3)5(SCN)]2+?

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

Why is [NiCl4]2− paramagnetic while [Ni(CN)4]2− is diamagnetic? (Atomic number of Ni = 28)

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

Why are low spin tetrahedral complexes rarely observed?

Concept: Bonding in Coordination Compounds - Crystal Field Theory (CFT)
Chapter: [9] Coordination Compounds
[3]12 | Attempt Any One
[3]12.1

Write one difference in Multimolecular colloid and Associated colloid

 

Concept: Colloids - Introduction
Chapter: [5] Surface Chemistry

Write one difference in Coagulation and Peptization

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

Write one difference in Homogeneous catalysis and Heterogeneous catalysis

Concept: Catalysis - Homogeneous and Heterogeneous Catalysis
Chapter: [5] Surface Chemistry
[3]12.2

What are the dispersed phase and dispersion medium in milk?

Concept: Emulsions
Chapter: [5] Surface Chemistry

Write one similarity between Physisorption and Chemisorption

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

Write the chemical method by which Fe(OH)3 sol is prepared from FeCl3.

Concept: Preparation of Colloids
Chapter: [5] Surface Chemistry
[3]13

The cell in which the following reaction occurs:

`2Fe^(3+) (aq) + 2I^(-) (aq) ---> 2Fe^(2+) (aq) + I_2 (s)` has `E_"cell"^@` = 0.236 V at  298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol−1)

Concept: Nernst Equation - Electrochemical Cell and Gibbs Energy of the Reaction
Chapter: [3] Electrochemistry

How many electrons flow through a metllic wire if a current of 0·5 A is passed for 2 hours? (Given : 1 F = 96,500 C mol−1)

Concept: Electrochemical Cells
Chapter: [3] Electrochemistry
[3]14

Based on the nature of intermolecular forces, classify the following solids:

Sodium sulphate, Hydrogen

Concept: General Characteristics of Solid State
Chapter: [1] Solid State

What happens when CdCl2 is doped with AgCl?

Concept: Imperfections in Solids - Types of Point Defects - Impurity Defects
Chapter: [1] Solid State

Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Concept: Magnetic Properties
Chapter: [1] Solid State
[3]15

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

Why does copper obtained in the extraction from copper pyrites have a blistered appearance?

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

What is the role of depressants in the froth floatation process?

Concept: Concentration of Ores - Froth Floatation Method
Chapter: [6] General Principles and Processes of Isolation of Elements
[3]16

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

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds

Write the structures of compounds A, B and C in the following reactions

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[3]17

Give reasons  Acetylation of aniline reduces its activation effect.

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

Give reasons for the following:

CH3NH2 is more basis than C6H5NH2.

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

Give reasons  Although –NH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[3]18

Give reasons for the following:

Red phosphorus is less reactive than white phosphorus.

Concept: P - Block Group 15 Elements - Phosphorus - Allotropic Forms
Chapter: [7] P - Block Elements

Give reasons for the following:

Electron gain enthalpies of halogens are largely negative.

Concept: Compounds of Halogens
Chapter: [7] P - Block Elements

Give reasons for the following: N2O5 is more acidic than N2O3

Concept: P - Block Group 16 Elements - Classification of Oxides
Chapter: [7] P - Block Elements
[3]19

Explain the following terms with suitable examples Cationic detergents

Concept: Cleansing Agents - Synthetic Detergents
Chapter: [16] Chemistry in Everyday Life

What is meant by the term ‘broad spectrum antibiotics’? Explain.

Concept: Therapeutic Action of Different Classes of Drugs - Antimicrobials
Chapter: [16] Chemistry in Everyday Life

Explain Tranquilizers

Concept: Drugs and Their Classification
Chapter: [16] Chemistry in Everyday Life
[3]20

Write the names of monomers used for getting the following polymers:

Teflon

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

Write the structures of the monomers used for getting the following polymers

Melamine – formaldehyde polymer

Concept: Polymers - Some Important Polymers
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]21

Following compounds are given to you :

2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane

1) Write the compound which is most reactive towards SN2 reaction.

2) Write the compound which is optically active.

3)  Write the compound which is most reactive towards β-elimination reaction. 

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[4]22

A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed.

(Given : log = 2 = 0·3010, log 3 = 0·4771, log 4 = 0·6021)

Concept: Integrated Rate Equations - First Order Reactions
Chapter: [4] Chemical Kinetics
[4]23

After watching a programme on TV about the presence of carcinogens (cancer causing agents) Potassium bromate and Potassium iodate in bread and other bakery products, Ritu a class XII student decided to aware others about the adverse effects of these carcinogens in foods. She consultanted the school principal and requested him to instruct canteen contractor to stop selling sandwiches, pizza, burgers and other bakery products to the students. Principal took an immediate action and instructed the canteen contractor to replace the bakery products with some proteins and vitamins rich food like fruits, salads, sprouts etc. The decision was welcomed by the parents and students.

After reading the above passage, answer the following questions:

1) What are the values (at least two) displayed by Ritu?

2) Which polysaccharide component of carbohydrates is commonly present in bread?

3) Write the two types of secondary structure of proteins.

4) Give two examples of water soluble vitamins.

Concept: Introduction of Proteins
Chapter: [14] Biomolecules
[5]24 | Attempt Any One
[5]24.1

Write the product(s) in the following reactions:

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes

Write the product(s) in the following reactions:

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes

Write the product(s) in the following reactions: 

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes

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

Butanal and Butan-2-one

Concept: Aldehydes and Ketones - Nomenclature
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
[5]24.2

Write the equations involved in the following reactions:

Etard reaction

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

Write the reaction involved in the Stephen reduction

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

How will you convert the following in not more than two steps:

Benzoic acid to Benzaldehyde

Concept: Abnormal Molar Masses
Chapter: [2] Solutions

How will you convert the following in not more than two steps:

Acetophenone to Benzoic acid

Concept: Abnormal Molar Masses
Chapter: [2] Solutions

How will you convert the following in not more than two steps:

Ethanoic acid to 2-Hydroxyethanoic acid

Concept: Types of Solutions
Chapter: [2] Solutions
[5]25 | Attempt Any One
[5]25.1

Give reasons: Transition metals show variable oxidation states.

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

Account for the following: 

Zn, Cd and Hg are soft metals.

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

Account for the following:

E° value for the Mn3+/Mn2+ couple is highly positive (+1.57 V) as compare to Cr3+/Cr2+.

Concept: Galvanic Cells - Measurement of Electrode Potential
Chapter: [3] Electrochemistry

Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

Concept: F-block Elements - The Actinoids
Chapter: [8] "D" and "F" Block Elements
[5]25.2

Following are the transition metal ions of 3d series:

Ti4+, V2+, Mn3+, Cr3+

(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)

Answer the following:

1) Which ion is most stable in an aqueous solution and why?

2) Which ion is a strong oxidising agent and why?

3) Which ion is colourless and why?

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

Complete the following equations:

`2MnO_4^(-)+16H^++5S^(2-)rarr`

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

Complete the following equations:

 KMnO4 

 

Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
Chapter: [7] P - Block Elements
[5]26 | Attempt Any One
[5]26.1

A 10% solution (by mass) of sucrose in water has freezing point of 269.15 K. Calculate the freezing point of 10% glucose in water, if freezing point of pure water is 273.15 K

Given : (Molar mass of sucrose = 342 g mol−1)

(Molar mass of glucose = 180 g mol−1)

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14] Biomolecules

Define Molality

Concept: Expressing Concentration of Solutions
Chapter: [2] Solutions

Define the term Abnormal molar mass

Concept: Abnormal Molar Masses
Chapter: [2] Solutions
[5]26.2

30 g of urea (M = 60 g mol−1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23·8 mm Hg.

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

Write two differences between an ideal solution and a non-ideal solution.

Concept: Types of Solutions
Chapter: [2] Solutions

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