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Chemistry 2013-2014 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Chemistry
Marks: 70Academic Year: 2013-2014
Date: October 2013

[7]1 | Select and write the most appropriate answers from the given alternatives for each sub-question:
[1]1.1

The Arrhenius equation is_________________ .

(a)`k=Ae^(RT/E_a)`                                                    

(b)`A=ke^(-E_a/(RT))`

(c)`k=Ae^(-(RT)/E_a)`

(d)`k=Ae^(-E_a/(RT))`

Concept: Collision Theory of Chemical Reactions
Chapter: [5] Chemical Kinetics
[1]1.2

If the enthalpy of vaporisation of water at 100oC is 186.5 J.mol-1, the entropy of vaporization will be_____________ .

(a) 4.0 J . K-1. mol-1                                               

(b) 3.0 J . K-l.  mol-1

(c) 1.5 J - K-1. mol-1                                             

(d) 0.5 J . K-l. mol-1

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.3

The atomicity of sulphur in orthorhombic sulphur is______________ .

(a) 8                                

(b) 6                                 

(c)  4                                

(d)  2

Concept: P - Block Group 16 Elements - Sulphur - Allotropic Forms
Chapter: [7.02] Group 16 Elements
[1]1.4

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

Concept: Classification of Crystalline Solids
Chapter: [1] Solid State
[1]1.5

The boiling point of water at high altitude is low. because________________ .

(a) the temperature is low.                                         

(b) the atmospheric pressure is low.

(c) the temperature is high.

(d) the atmospheric pressure is high

Concept: Solubility - Solubility of a Solid in a Liquid
Chapter: [2] Solutions and Colligative Properties
[1]1.6

 

The molar conductivity of cation and anion of salt BA are 180 and 220 mhos respectively. The molar conductivity of salt BA at infinite dilution is_____________ .

(a) 90 mhos.cm2                                                                             

(b) 110 mhos.cm2.mol-1

(c) 200 mhos.cm2.mol-1                                                                 

(d) 400 mhos.cm2.mol-1

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [4] Electrochemistry
[1]1.7

What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?

(a) Polling                      

(b) Pyrometallurgy

(c) Hydrometallurgy

(d) Calcination

Concept: Oxidation Reduction
Chapter: [6] General Principles and Processes of Isolation of Elements
[9]2 | Answer any THREE of the following
[3]2.1

Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -
(a) Magnetic property                                        
(b) Oxidation state
(c) Hydrides

Concept: P - Block Group 16 Elements - Anomalous Behaviour of Oxygen
Chapter: [7.02] Group 16 Elements
[3]2.2

What is the value of for the following reaction at 298 K -

6CO2+ 6H20(l) → C6H1206(s) + 602(g),

Given that: ΔG° = 2879 kj mol-1, AS = -210 JK-1 mol-1.

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [4] Electrochemistry
[3]2.3

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[3]2.4

A solution containing 0.73 g of camphor (molar mass 152 g . mol-1) in 36.8 g of acetone (boiling point 56.3°C) boils at 56.55°C. A solution of 0.564 g of unknown compound in the same weight of acetone boils at 56.46oC. Calculate the molar mass of the unknown compound.

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions and Colligative Properties
[12]3 | Answer any SIX of the following :
[2]3.1

Describe triclinic crystal lattice with the help of a diagram.

Concept: Crystal Lattices and Unit Cells - Introduction
Chapter: [1] Solid State
[2]3.2

Write any four applications of electrochemical series

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
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[2]3.3

State and explain Hess’s law of constant heat summation.

Concept: Chemical Thermodynamics and Energetic - Hess’ Law of Constant Heat Summation
Chapter: [3] Chemical Thermodynamics and Energetic
[2]3.4

Distinguish between : Order and Molecularity of reaction

Concept: Factors Influencing Rate of a Reaction
Chapter: [5] Chemical Kinetics
[2]3.5

With the help of the equation ΔG° = - nFEocell. Explain that cell potential is an intensive property.

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [4] Electrochemistry
[2]3.6

Describe the laboratory method of preparation of ammonia

Concept: P - Block Group 15 Elements - Ammonia
Chapter: [7.01] Group 15 Elements
[2]3.7

Define van’t Hoff factor.

Concept: Abnormal Molar Masses
Chapter: [2] Solutions and Colligative Properties

How van’t Hoff factor is related to the degree of dissociation?

Concept: Abnormal Molar Masses
Chapter: [2] Solutions and Colligative Properties
[2]3.8

Write chemical formulae of the following ores :

(a) Calamine 

(b) Haematite                     

(c) Magnetite

(d) Corundum

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[7]4 | Answer any ONE of the following:
[7]4.1

Write the reactions involved in extraction of silver from its ore by leaching process.

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

Derive the equation : W = - PextAV

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [3] Chemical Thermodynamics and Energetic

A unit cell of iron crystal has edge length 288 pm and density 7.86 g.cm-3. Find the number of atoms per unit cell and type of the crystal lattice.

Given : Molar mass of iron = 56 g.mol-1; Avogadro's number NA = 6.022 x 1023.

Concept: Number of Atoms in a Unit Cell
Chapter: [1] Solid State
[7]4.2

Define : Cryoscopic constant.

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

What is the action of hot/concentrated nitric acid on - Arsenic   

Concept: P - Block Group 15 Elements - Nitric Acid
Chapter: [7.01] Group 15 Elements

Draw the structure of: Orthophosphoric acid 

Concept: P - Block Group 15 Elements - Compounds of Phosphorus
Chapter: [7.01] Group 15 Elements

How much electricity in terms of Faraday is required to produce :

(a) 20 g of Ca from molten CaCl2                     

(b) 40 g of Al from molten Al203

(Given : Molar mass of Calcium and Aluminium are 40 g.mol-1 and 27 g.mol-1 respectively.)

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry

Draw the structure of: Pyrophosphoric acid

Concept: P - Block Group 15 Elements - Compounds of Phosphorus
Chapter: [7.01] Group 15 Elements

What is the action of hot/concentrated nitric acid on - Antimony.

Concept: P - Block Group 15 Elements - Nitric Acid
Chapter: [7.01] Group 15 Elements
[7]5 | Select and write the most appropriate answers from the given alternatives for each sub-question
[1]5.1

Which of the followings is a trihydric alcohol ?

(a) n-propyl alcohol

(b) Glycerol                         

(c)  Glycol                       

(d) Glycine

Concept: Classification of Alcohols and Phenols
Chapter: [11.01] Alcohols
[1]5.2

Alkyl halides are -

(a) Mono halogen derivatives of alkanes 

(b) Di halogen derivatives of alkanes

(c) Tri halogen derivatives of alkanes

(d) Tetra halogen derivatives of alkanes

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[1]5.3

Mohr’s Salt is -

(a) Ferrous ammonium sulphate

(b) Ferrous sulphate

(c) Ammonium sulphate

(d) Ferric sulphate

Concept: Werner’S Theory of Coordination Compounds
Chapter: [9] Coordination Compounds
[1]5.4

Which of the following is polyamide ?

(a) Teflon

(b) Nylon  6,6

(c) Terylene

(d) Bakelite

 

Concept: Polymers - Nylon 66
Chapter: [15] Polymers
[1]5.5

Vitamin ‘C’ belongs to the class of—

(a) Vitamins of aliphatic series

(b) Vitamins of aromatic series

(c) Vitamins of alicyclic series

(d) Vitamins of heterocyclic series

 

Concept: Vitamins - Classification of Vitamins
Chapter: [14.03] Vitamins
[1]5.6

What is the IUPAC name of 

α - Amino butanoic acid    

2 - Amino butyric acid

α - Aminobutyric acid  

2 - Amino butanoic acid

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
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[1]5.7

Which among the following molecular formulae represents urotropine?

(a) C6H12N4

(b) C6H24H4                    

(c) C6H12N4O2

(d) C6H24N4O2

Concept: Amines - Nomenclature
Chapter: [13.01] Amines
[9]6 | Answer any THREE of the following
[3]6.1

Write the structures of - 3-chloro-3-ethylhex-1-ene

 

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes

Write the structures of -1-Iodo-2, 3-dimethylbutane

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes

Write the structures of - 1, 3, 5 - tribromobenzene

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[3]6.2

What is the action of acidified potassium dichromate on - SO2

 

Concept: D-block Elements - Some Important Compounds of Transition Elements
Chapter: [8.01] D-block Elements

What is the action of acidified potassium dichromate on - KI 

Concept: D-block Elements - Some Important Compounds of Transition Elements
Chapter: [8.01] D-block Elements

Draw structure of dichromate ion

Concept: D-block Elements - Some Important Compounds of Transition Elements
Chapter: [8.01] D-block Elements
[3]6.3

Describe laboratory method for preparation of glucose.

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates

Write the reaction that indicates the presence of -CHO group in glucose

Concept: Carbohydrates - Structures of Glucose
Chapter: [14.01] Carbohydrates
[3]6.4

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on ethyl amine

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on aniline

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on triethyl amine

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines
[9]7 | Answer any SIX of the following :
[2]7.1

What are chemical twins? Write ‘two’ examples.

Concept: F-block Elements - The Lanthanoids
Chapter: [8.02] F-block Elements
[2]7.2

Explain the term Antiseptics

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines

Explain trem Analgesics.

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[2]7.3

Draw the simple Fisher projection formulae of D - (+) - glucose and D - (-) - fructose

Concept: Carbohydrates - Structures of Glucose
Chapter: [14.01] Carbohydrates
[2]7.4

Classify the following ligands into monodentate and polydentate —

  1. Ammonia
  2. Carbon monoxide
  3. Ethylene diamine
  4. Ethylene diamine tetra acetate ion
Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[2]7.5

State and explain Markownikoff's rule with suitable example

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Elimination Reactions
Chapter: [10.01] Haloalkanes
[2]7.6

How are propan-1-amine and propan-2-amine prepared from oxime?

Concept: Amines - Preparation of Amines
Chapter: [13.01] Amines
[2]7.7

Identify ‘A' and ‘B’ in the following reaction :

C6H5MgBr + C02 `(`> ‘A’   `(PCl_5)/()`> ‘B’

 

Concept: Carboxylic Acids - Methods of Preparation of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
[2]7.8

What is the action of the following reagents on phenol - Bromine in CS2 at low temperature.

 

Concept: Phenols - Electrophillic Substitution Reactions
Chapter: [11.02] Phenols

What is the action of the following reagents on phenol - H2SO4 at room temperature.

Concept: Phenols - Electrophillic Substitution Reactions
Chapter: [11.02] Phenols
[7]8 | Answer any ONE of the following:
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[7]8.1

Write the structure and IUPAC names of all the metamers represented by formula C4H10

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

Write balanced chemical equations for action of ammonia on - formaldehyde

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones

Write balanced chemical equations for action of ammonia on - acetaldehyde

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones

Write balanced chemical equations for action of ammonia on - acetone

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[7]8.2

Write ‘four’ characteristics of co-ordinate complex ion.

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

How is Nylon 6, 6 prepared?

Concept: Polymers - Nylon 66
Chapter: [15] Polymers

Write any ‘two' uses of terylene.

Concept: Polymers - Some Important Polymers
Chapter: [15] Polymers

Write ‘four’ physical methods of preserving food materials

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16.02] Chemicals in Food

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