# Chemistry Delhi Set 2 2016-2017 CBSE (Commerce) Class 12 Question Paper Solution

Chemistry [Delhi Set 2]
Date & Time: 24th March 2017, 12:30 pm
Duration: 3h

[1]1

Write one similarity between Physisorption and Chemisorption

Chapter: [5] Surface Chemistry
[1]2

Write the structure of 2,4-dinitrochlorobenzene

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[1]3

For a reaction R ---> P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?

Concept: Factors Influencing Rate of a Reaction
Chapter: [4] Chemical Kinetics
[1]4

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines

CH3NHCH(CH3)2

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[1]5

Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8] "D" and "F" Block Elements
[2]6

Calculate the degree of dissociation (α) of acetic acid if its molar conductivity (Λm) is 39.05 S cm2 mol−1.

Given λ°(H+) = 349.6 S cm2 mol−1 and λ°(CH3COO) = 40.9 S cm2 mol−1

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [3] Electrochemistry
[2]7

Draw the structures of H_3PO_2

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

Draw the structures of the following molecules: XeF4

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]8

Define the terms: Ideal solution

Concept: Types of Solutions
Chapter: [2] Solutions

Define Molarity (M)

Concept: Expressing Concentration of Solutions
Chapter: [2] Solutions
[2]9 | Attempt Any One
[2]9.1

Complete chemical reactions are:Cl2 + H2O →

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

Complete the following reactions : XeF6 + 3H2O →

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]9.2

What happens when conc. is H2SO4 added to Cu? Write the equations.

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

What happens when SO3 is passed through water? Write the equations.

Concept: P - Block Group 16 Elements - Compounds of Sulphur
Chapter: [7] P - Block Elements
[2]10

Write the reactions involved Hell-Volhard Zelinsky reaction?

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

Write the reactions involved Decarboxylation reaction

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving –COOH Group
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[3]11

Write one difference in Lyophobic sol and Lyophilic sol

Concept: Classification of Colloids - Classification Based on Physical State of Dispersed Phase and Dispersion Medium
Chapter: [5] Surface Chemistry

Write one difference in Solution and Colloid

Concept: Types of Solutions
Chapter: [2] Solutions

Write one difference in Homogeneous catalysis and Heterogeneous catalysis

Concept: Catalysis - Homogeneous and Heterogeneous Catalysis
Chapter: [5] Surface Chemistry
[3]12

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
[3]13

Outline the principles of refining of metals by the following methods:  Vapour phase refining

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

What is the principle behind the zone refining of metals?

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

What is meant by the term “chromatography”?

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[3]14

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
[3]15

Explain the following terms with suitable examples Cationic detergents

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

Define the following : Narrow spectrum antibiotics

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

Define the following : Disinfectants

Concept: Antiseptics and Disinfectants Prevent Catching Diseases
Chapter:
[3]16

Calculate the mass of Ag deposited at cathode when a current of 2 amperes was passed through a solution of AgNO3 for 15 minutes.

(Given : Molar mass of Ag = 108 g mol−1 lF = 96500 C mol−1)

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [3] Electrochemistry

Define terms: Fuel cell

Concept: Batteries - Primary Batteries
Chapter: [3] Electrochemistry
[3]17

What type of isomerism is shown by the complex [Co(NH3)6] [Cr(CN)6]?

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

Why a solution of [Ni(H2O)6]2+ is green while a solution of [Ni(CN)4]2− is colourless? (At. no. of Ni = 28)

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

Write the IUPAC name of the following complex : [Co(NH3)5(CO3)]Cl.

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[3]18 | Attempt Any One
[3]18.1

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

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

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

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[3]18.2

How will you bring about the following conversions in not more than two steps?

Benzoic acid to Benzaldehyde

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

Do the following conversions in not more than two steps :

Ethyl benzene to Benzoic acid

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

Do the following conversions in not more than two steps :

Propanone to Propene

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[3]19

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

Concept: Polymers - Classification of Polymers Based on Molecular Forces
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 names and structures of the monomers of the following polymers: Buna-S

Concept: Polymers - Classification of Polymers Based on Mode of Polymerisation
Chapter: [15] Polymers
[3]20

Following data are obtained for reaction :

N2O5 → 2NO2 + 1/2O2

 t/s 0 300 600 [N2O5]/mol L–1 1.6 × 10-2 0.8 × 10–2 0.4 × 10–2

1) Show that it follows first order reaction.

2) Calculate the half-life.

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

Concept: Integrated Rate Equations - First Order Reactions
Chapter: [4] Chemical Kinetics
[3]21

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 CH3NH2 is more basic than C6H5NH2.

Concept: Physical Properties 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]22

Give reasons Thermal stability decreases from H2O to H2Te.

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

Give reasons Fluoride ion has higher hydration enthalpy than chloride ion.

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

Nitrogen does not form pentahalide.

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

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

Write the product(s) in the following reactions

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

Write the product(s) in the following reaction

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

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

Ethanol and phenol

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

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

Propanol and 2-methylpropan-2-ol

Concept: Physical Properties of Ethers
Chapter: [11] Alcohols, Phenols and Ethers
[5]24.2

Write the formula of reagents used in the following reactions :

Bromination of phenol to 2,4,6-tribromophenol

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

Write the formula of reagents used in the following reactions :

Hydroboration of propene and then oxidation to propanol.

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

Arrange the following compound groups in the increasing order of their property indicated :

p-nitrophenol, ethanol, phenol (acidic character)

Concept: Introduction of Coordination Compounds
Chapter: [9] Coordination Compounds

Arrange the following compound groups in the increasing order of their property indicated :

Propanol, Propane, Propanal (boiling point)

Concept: Introduction of Coordination Compounds
Chapter: [9] Coordination Compounds

Write the mechanism (using curved arrow notation) 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
[5]25 | Attempt Any One
[5]25.1

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

Give examples and suggest reasons for the following features of the transition metal chemistry:

The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.

Concept: General Properties of the Transition Elements (D-block)
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

How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.

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

Explain why Cu+ ion is not stable in aqueous solutions?

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

Orange colour of Cr_2O_7^(2–) ion changes to yellow when treated with an alkali. Why?

Concept: Amines - Chemical Reactions of Amines - Alkylation and Acylation
Chapter: [13] Organic Compounds Containing Nitrogen

How would you account for the following:

The chemistry of actinoids is more complicated as compared to lanthanoids.

Concept: F-block Elements - The Actinoids
Chapter: [8] "D" and "F" Block Elements
[5]26 | Attempt Any One
[5]26.1

An element has atomic mass 93 g mol–1 and density 11.5 g cm–3. If the edge length of its unit cell is 300 pm, identify the type of unit cell

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

Write any two differences between amorphous solids and crystalline solids

Concept: Amorphous and Crystalline Solids
Chapter: [1] Solid State
[5]26.2

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

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

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

Give reasons : Silicon on doping with Phosphorous forms n-type semiconductor.

Concept: Electrical Properties - Applications of N-type and P-type Semiconductors
Chapter: [1] Solid State

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

Concept: Magnetic Properties
Chapter: [1] Solid State

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