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Chemistry Delhi Set 1 2013-2014 CBSE (Commerce) Class 12 Question Paper Solution

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Chemistry [Delhi Set 1]
Marks: 70Academic Year: 2013-2014
Date: March 2014

[1]1

Give one example each of 'oil in water' and 'water in oil' emulsion.

Concept: Emulsions
Chapter: [5] Surface Chemistry
[1]2

Which reducing agent is employed to get copper from the leached low-grade copper ore?

Concept: Concentration of Ores - Leaching
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]3

Which of the following is a more stable complex and why ?

\[\left[ Co \left( {NH}_3 \right)_6 \right]^{3 +} and \left[ Co \left( en \right)_3 \right]^{3 +}\]
Concept: Introduction of Coordination Compounds
Chapter: [9] Coordination Compounds
[1]4

Write the IUPAC name of the compound.

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[1]5

Which of the following isomers is more volatile:

o-nitrophenol or p-nitrophenol?

Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
Chapter: [9] Coordination Compounds
[1]6

What are isotonic solutions?

Concept: Types of Solutions
Chapter: [2] Solutions
[1]7

Arrange the following compounds in increasing order of solubility in water :

C6H5NH2, (C2H5)2NH, C2H5NH2

 

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]8

Which of the two components of starch is water soluble?

Concept: Colligative Properties and Determination of Molar Mass - Reverse Osmosis and Water Purification
Chapter: [2] Solutions
[2]9

An element with density 11.2 g cm–3 forms a f.c.c. lattice with edge length of 4 × 10–8 cm.
Calculate the atomic mass of the element.
(Given : NA = 6.022 × 1023 mol–1)

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

Examine the given defective crystal:

Answer the following questions :
(i) What type of stoichiometric defect is shown by the crystal?
(ii) How is the density of the crystal affected by this defect?
(iii) What type of ionic substances show such defect?

Concept: Imperfections in Solids - Types of Point Defects - Stoichiometric Defects
Chapter: [1] Solid State
[2]11

Calculate the mass of a compound (molar mass = 256 g mol−1) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 K (Kf = 5.12 K kg mol−1).

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions
[2]12

Define an ideal solution and write one of its characteristics.

Concept: Ideal and Non-ideal Solutions
Chapter: [2] Solutions
[2]13

Write two differences between 'order of reaction' and 'molecularity of reaction'.

Concept: Pseudo First Order Reaction
Chapter: [4] Chemical Kinetics
[2]14
[1]14.1

Outline the principles behind the refining of metals by the following methods:

Zone refining method

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]14.2

Outline the principles behind the refining of metals by the following methods:

Chromatographic method

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[2]15 | attempt any one of the following
[2]15.1
[1]15.1.1

Complete the following chemical equations :

Ca3P2 + H2O →

Concept: P - Block Group 15 Elements - Phosphine
Chapter: [7] P - Block Elements
[1]15.1.2

Complete the following chemical equations :

Cu + H2SO4(conc.) →

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[2]16

Write the IUPAC name of the complex [Cr(NH3)4Cl2]+. What type of isomerism does it exhibit?

Concept: Isomerism in Coordination Compounds - Structural Isomerism
Chapter: [9] Coordination Compounds
[2]17
[1]17.1

Which alkyl halide from the following pair is chiral and undergoes faster SN2 reaction?

Concept: Amines - Chemical Reactions of Amines - Alkylation and Acylation
Chapter: [13] Organic Compounds Containing Nitrogen
[1]17.2

Out of SN1 and SN2, which reaction occurs with

(a) Inversion of configuration
(b) Racemisation

Concept: Amines - Chemical Reactions of Amines - Alkylation and Acylation
Chapter: [13] Organic Compounds Containing Nitrogen
[2]18
[1]18.1

Draw the structure of major monohalo product in each of the following reactions :

Concept: Classification of Haloalkanes and Haloarenes
Chapter: [10] Haloalkanes and Haloarenes
[1]18.2

Draw the structure of major monohalo product in each of the following reactions :

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10] Haloalkanes and Haloarenes
[3]19
[1]19.1

In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the form of an equation.

Concept: Adsorption Isotherms
Chapter: [5] Surface Chemistry
[1]19.2

Write an important characteristic of lyophilic sols.

Concept: Classification of Colloids - Classification Based on Type of Particles of the Dispersed Phase, Multimolecular, Macromolecular and Associated Colloids
Chapter: [5] Surface Chemistry
[1]19.3

Based on the type of particles of dispersed phase, give one example each of associated colloid and multimolecular colloid.

Concept: Colloids Around Us
Chapter: [5] Surface Chemistry
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[3]20
[1]20.1

Write the structures of the following molecules: XeOF4

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7] P - Block Elements
[1]20.2

Draw the structures of the following: H2SO4

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7] P - Block Elements
[1]20.3

Write the structural difference between white phosphorus and red phosphorus.

 
Concept: Concept of Group 15 Elements
Chapter: [7] P - Block Elements
[3]21
[1]21.1

Account for the following:

PCl5 is more covalent than PCl3.

Concept: Electrical Properties - Conduction of Electricity in Metals
Chapter: [1] Solid State
[1]21.2

Account for the following :

Iron on reaction with HCl forms FeCl2 nd not FeCl3.

Concept: Uses of Aluminium, Copper, Zinc and Iron
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]21.3

The two O−O bond lengths in the ozone molecule are equal.

Concept: P - Block Group 16 Elements - Ozone
Chapter: [7] P - Block Elements
[3]22

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]23
[1]23.1

Give two examples of macromolecules that are chosen as drug targets

Concept: Drug-target Interaction - Receptors as Drug Targets
Chapter: [16] Chemistry in Everyday Life
[1]23.2

Explain the term Antiseptics

Concept: Drugs and Their Classification
Chapter: [16] Chemistry in Everyday Life
[1]23.3

Why is use of aspartame limited to cold foods and drinks?

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16] Chemistry in Everyday Life
[3]24
[1]24.1

Deficiency of which vitamin causes night-blindness?

Concept: Vitamins - Classification of Vitamins
Chapter: [14] Biomolecules
[1]24.2

Name the base that is found in nucleotide of RNA only.

Concept: Introduction of Nucleic Acids
Chapter: [14] Biomolecules
[1]24.3

Glucose on reaction with HI gives n-hexane. What does it suggest about the structure of glucose?

 

 
Concept: Carbohydrates - Structures of Glucose
Chapter: [14] Biomolecules
[3]25

After the ban on plastic bags, students of a school decided to make people aware of the harmful effects of plastic bags on the environment and Yamuna River. To make the awareness more impactful, they organised a rally by partnering with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All the students pledged not to use polythene bags in the future to save the Yamuna River.

After reading the above passage, answer the following questions:
(i) What values are shown by the students?
(ii) What are bio-degradable polymers? Give one example.
(iii) Is polythene a condensation or an addition polymer?

Concept: Molecular Mass of Polymers
Chapter: [15] Polymers
[3]26
[2]26.1

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

Concept: Amines - Preparation of Amines
Chapter: [13] Organic Compounds Containing Nitrogen
[1]26.2

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

Concept: Chemical Reactions of Phenols (Only)
Chapter: [11] Alcohols, Phenols and Ethers
[3]27 | attempt any one of the following
[3]27.1
[1]27.1.1

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

Concept: Structure of Amines
Chapter: [13] Organic Compounds Containing Nitrogen
[1]27.1.2

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

Concept: Structure of Amines
Chapter: [13] Organic Compounds Containing Nitrogen
[2]27.1.3
[3]27.2
[1]27.2.1

How will you convert the following?

Nitrobenzene into aniline

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[1]27.2.2

How will you convert Ethanoic acid into methanamine

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[1]27.2.3

How will you convert the following?

Aniline into N−phenylethanamide

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[5]28 | attempt any one of the following
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[5]28.1
[1]28.1.1

Define the following terms :

Limiting molar conductivity

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [3] Electrochemistry
[1]28.1.2

Define the following terms

Fuel cell

Concept: Electrochemical Cells
Chapter: [3] Electrochemistry
[3]28.1.3

Resistance of a conductivity cell filled with 0.1 mol L−1 KCl solution is 100 Ω. If the resistance of the same cell when filled with 0.02 mol L−1 KCl solution is 520 Ω, calculate the conductivity and molar conductivity of 0.02 mol L−1KCl solution. The conductivity of 0.1 mol L−1 KCl solution is 1.29 × 102 Ω−1 cm−1.

Concept: Conductance of Electrolytic Solutions - Introduction
Chapter: [3] Electrochemistry
[5]28.2
[2]28.2.1

State Faraday's first law of electrolysis. How much charge in terms of Faraday is required for the reduction of 1 mol of Cu2+ to Cu.

Concept: Faraday’s Law of Induction
Chapter: [3] Electrochemistry
[3]28.2.2

Calculate emf of the following cell at 298 K:
Mg(s) | Mg2+(0.1 M) || Cu2+ (0.01) | Cu(s)
[Given Eocell = +2.71 V, 1 F = 96500 C mol–1]

Concept: Nernst Equation - Introduction
Chapter: [3] Electrochemistry
[5]29 | attempt any one of the following
[5]29.1
[1]29.1.1

How do you prepare:

K2MnO4 from MnO2?

Concept: P - Block Group 16 Elements - Classification of Oxides
Chapter: [7] P - Block Elements
[1]29.1.2

How do you prepare:

Na2Cr2O7 from Na2CrO4?

Concept: P - Block Group 16 Elements - Sulphur - Allotropic Forms
Chapter: [7] P - Block Elements
[1]29.1.3

Account for the following:

Mn2+ is more stable than Fe2+ towards oxidation to +3 state.

Concept: Electronic Configurations of the D-block Elements
Chapter: [8] "D" and "F" Block Elements
[1]29.1.4

Account for the following 

The enthalpy of atomisation is lowest for Zn in 3d series of the transition elements.

Concept: Concept of Group 15 Elements
Chapter: [7] P - Block Elements
[1]29.1.5

How do you prepare:

Actinoid elements show wide range of oxidation states.

Concept: F-block Elements - The Actinoids
Chapter: [8] "D" and "F" Block Elements
[5]29.2
[1]29.2.1

Name the elements of 3d transition series that show maximum number of oxidation states. Why does this happen?

Concept: Electronic Configurations of the D-block Elements
Chapter: [8] "D" and "F" Block Elements
[1]29.2.2

Which transition metal of 3d series has positive E° (M2+/M) value and why?

Concept: Electronic Configurations of the D-block Elements
Chapter: [8] "D" and "F" Block Elements
[1]29.2.3

Out of Cr3+ and Mn3+, which is a stronger oxidising agent and why?

Concept: Electronic Configurations of the D-block Elements
Chapter: [8] "D" and "F" Block Elements
[1]29.2.4

Name a member of the lanthanoid series that is well-known to exhibit +2 oxidation state.

Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Chapter: [8] "D" and "F" Block Elements
[1]29.2.5

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
[5]30 | attempt any one of the following
[5]30.1
[1]30.1.1

Write the products of the following reactions:

Concept: Carbohydrates - Oligosaccharides
Chapter: [14] Biomolecules
[1]30.1.2

Write the products of the following reactions:

Concept: Carbohydrates - Oligosaccharides
Chapter: [14] Biomolecules
[1]30.1.3

Write the products of the following reactions:

Concept: Carbohydrates - Oligosaccharides
Chapter: [14] Biomolecules
[1]30.1.4

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

Benzaldehyde and Benzoic acid

Concept: Amines - Nomenclature
Chapter: [13] Organic Compounds Containing Nitrogen
[1]30.1.5

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
[1]30.2.1

Account for the following:

CH3CHO is more reactive than CH3COCH3 towards reaction with HCN.

Concept: Physical and Chemical Properties of Alcohols and Phenols
Chapter: [11] Alcohols, Phenols and Ethers
[1]30.2.2

Account for the following:

Carboxylic acid is a stronger acid than phenol.

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]30.2.3

Write the equations involved in the following reactions :

Wolff-Kishner reduction

Concept: Carboxylic Acids - Nomenclature
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
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[1]30.2.4

Write the chemical equations to illustrate the following name reactions:

Aldol condensation

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Other Reactions
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
[1]30.2.5

Write the chemical equations to illustrate the following name reactions:

Cannizzaro reaction

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