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Chemistry Delhi Set 1 2016-2017 CBSE (Commerce) Class 12 Question Paper Solution

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Chemistry [Delhi Set 1]
Marks: 70Date: 2017-03-24
Duration: 3h

[1]1

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

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[1]2

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

(CH3CH2)2NCH3

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 the structure of 1-Bromo-4-chlorobut-2-ene

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10] Haloalkanes and Haloarenes
[1]5

Write one similarity between Physisorption and Chemisorption

Concept: Adsorption - Types of Adsorption
Chapter: [5] Surface Chemistry
[2]6 | Attempt Any One
[2]6.1

Complete the following reactions

NH3+3Cl2(excess) ---->

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

Complete the following reactions:

XeF6+2H2O ----->

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]6.2

What happens when (NH4)2Cr2O7 is heated? Write the equations.

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

What happens when 

H3PO3 is heated ?

Write the reactions involved.

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

Define the term Colligative properties

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

Define Molality

Concept: Expressing Concentration of Solutions
Chapter: [2] Solutions
[2]8

Draw the structures of the following:

H2S2O7

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

Draw the structures of the following

XeF6

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[2]9

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]10

Write the chemical reaction involved in Wolff-Kishner reduction.

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

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
[3]11

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]12

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]13

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]14

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]15

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]16

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]17

Name the method of refining of metals such as Germanium.

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

Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?

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

What is the significance of leaching in the extraction of aluminium?

Concept: Concentration of Ores - Leaching
Chapter: [6] General Principles and Processes of Isolation of Elements
[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 names and structures of the monomers of the following polymers: Dacron 

 

Concept: Polymers - Classification of Polymers Based on Mode of Polymerisation
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 names and chemical formulae of monomers used in preparing Buna-N.

Concept: Types of Polymerisation Reactions - Rubber
Chapter: [15] Polymers
[3]20

Explain the following terms with suitable examples - Anionic 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 the term Antiseptics

Concept: Drugs and Their Classification
Chapter: [16] Chemistry in Everyday Life
[3]21

Give reasons Thermal stability decreases from H2O to H2Te.

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

Account for the following : Nitrogen does not form pentahalide.

Concept: P - Block Group 15 Elements - Dinitrogen
Chapter: [7] P - Block Elements
[3]22

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
[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

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]24.2

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]25 | Attempt Any One
[5]25.1

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]25.2

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
[5]26 | Attempt Any One
[5]26.1

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]26.2

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

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