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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: March 2014

[7]1 | Answer any ONE of the following
[7]1.1

Define boiling point

Concept: Types of Solutions
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions

Define cell constant.

Concept: Conductance of Electrolytic Solutions - Introduction
Chapter: [0.04] Electrochemistry

Derive a relation between ΔH and ΔU for a chemical reaction. Draw neat labelled diagram of calomel electrode. Resistance and conductivity of a cell containing 0.001 M KCI solution at 298K are 1500Ω and 1.46x10-4 S.cm-1 respectively.

Concept: Electrochemical Cells
Chapter: [0.04] Electrochemistry [0.05] Electrochemistry
[7]1.2

Write molecularity of the following reaction:

2NO(g)+O2(g)→2NO2(g)

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics

What is calcination?

Concept: Oxidation Reduction
Chapter: [0.06] General Principles and Processes of Isolation of Elements

How does calcination differ from roasting?

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics

Write resonating structures of ozone.

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics

The decomposition of N2O5(g) at 320K according to the following equation follows first order reaction:

`N_2O_(5(g))->2NO_(2(g))+1/2O_(2(g))`

The initial concentration of N2O5(g) is 1.24 x 10-2 mol. L-1 and after 60 minutes 0.20x10-2 molL-1. Calculate the rate constant of the reaction at 320K.

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics
[9]2 | Answer any THREE of the following:
[3]2.1

One mole of a gas expands by 3L against a constant pressure of 3 atmosphere. Calculate the work done in -

(a) L.atmosphere

(b) Joules

(c) Calories

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [0.03] Chemical Thermodynamics and Energetic
[3]2.2

Calculate the amount of CaCl2 (van't Hoff factor i = 2.47) dissolved in 2.5 L solution so that its osmotic pressure at 300K is 0.75 atmosphere.

Given : Molar mass of CaCl2 is 111g mol-1

R=0.082 L.atm K-1mol-1

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [0.02] Solutions and Colligative Properties
[3]2.3

Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :

(a) Hydrogen bonding

(b) Oxidation state

(c) Polyhalide ions

 

Concept: P - Block Group 17 Elements - Anomalous Behaviour of Fluorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
[3]2.4

Face centred cubic crystal lattice of copper has density of 8.966 g.cm-3. Calculate the volume of the unit cell. Given molar mass of copper is 63.5 g mol-1 and Avogadro number Nis 6.022 x 1023 mol-1

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[12]3 | Answer any SIX of the following
[2]3.1

What is the action of the following reagents on ammonia : 
Nessler's reagent

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

What is the action of the following reagents on ammonia :
Sodium metal

Concept: P - Block Group 15 Elements - Ammonia
Chapter: [7.01] Group 15 Elements
[2]3.2

State the first law of electrolysis

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [0.04] Electrochemistry

State second law of electrolysis

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [0.04] Electrochemistry
[2]3.3

Draw neat and labelled diagram of Bessermer converter used in the extraction of copper.

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[2]3.4

Derive the relation between half life and rate constant for a first order reaction

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [0.05] Chemical Kinetics
[2]3.5
 

Derive the relation between `DeltaG^@`and equilibrium constant (K) for the reaction -

aA_bB ⇌ cC+dD.

 
Concept: Chemical Thermodynamics and Energetic - Equilibrium Constant
Chapter: [0.03] Chemical Thermodynamics and Energetic
[2]3.6

Explain brown ring test with the help of chemical equation

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

Explain, why do aquatic animals prefer to stay at lower level of water during summer?

Concept: Solubility - Solubility of a Gas in a Liquid
Chapter: [0.02] Solutions and Colligative Properties
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[2]3.8

Distinguish between crystalline solid and amorphous solid

Concept: Amorphous and Crystalline Solids
Chapter: [0.01] Solid State
[7]4 | Select and write the most appropriate answer from the alternative given below each sub-quest.ion :
[1]4.1

To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:

(a) 2

(b) 3

(c) 4

(d) 5

Concept: Electrical Properties - Applications of N-type and P-type Semiconductors
Chapter: [0.01] Solid State
[1]4.2

Number of faradays of electricity required to liberate 12 g of hydrogen is:

1

8

12

16

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [0.04] Electrochemistry
[1]4.3

What is molecular formula of oleum?

(a) H2SO3

(b) H2SO4

(c) H2S2O7

(d) H2S2O8

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[1]4.4

Purification of aluminium by electrolytic refining is carried out by

(a)Hoope process

(b)Hall process

(c)Baeyer process

(d)Serperck process

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[1]4.5

The rate of reaction for certain reaction is expressed as :

`1/3(d[A])/dt=-1/2(d[B])/dt=-(d[C])/dt`

 The reaction is

(a) 3A→2B+C

(b) 2B→3A+C

(c) 2B+C→3A

(d) 3A+2B→C

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[1]4.6

A system absorbs 640 J heat and does work of 260 J, the change in internal energy of the system will be

(a) +380J

(b) -380J

(c) +900J

(d) -900J

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [0.03] Chemical Thermodynamics and Energetic
[1]4.7

Which of the following is not a colligative property?

Vapour pressure

Depression in freezing point

Elevation in boiling point

Osmotic pressure

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
[7]5 | Answer any ONE
[7]5.1

Write the structural formula and IUPAC names of all possible isomers of the compound with molecular formula C3H8O.

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols

Write 'two' uses of phenol.

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols

What happens when glucose is treated with Bromine water

 

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols

What happens when glucose is treated with - Dilute nitric acid

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols

What happens when glucose is treated with Hydrogen cyanite (HCN).

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols
[7]5.2

Write the molecular formula and structural formula of BHA and BHT.

 

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [0.15] Polymers

Write a note on aldol condensation.

Concept: Types of Polymerisation Reactions - Condensation Polymerisation Or Step Growth Polymerisation
Chapter: [0.15] Polymers

What are thermoplastic polymers?

 

Concept: Types of Polymerisation Reactions - Condensation Polymerisation Or Step Growth Polymerisation
Chapter: [0.15] Polymers
[9]6 | Answer any THREE
[3]6.1

What is the action of the following reagents on aniline?

Bromine water

Concept: Amines - Chemical Reactions of Amines - Electrophilic Substitution
Chapter: [13.01] Amines

What is the action of the following reagents on aniline?

Acetic anhydride

 

Concept: Amines - Chemical Reactions of Amines - Electrophilic Substitution
Chapter: [13.01] Amines

What is the action of the following reagents on aniline?

Hot and conc. sulphuric acid

Concept: Amines - Chemical Reactions of Amines - Electrophilic Substitution
Chapter: [13.01] Amines
[3]6.2

Discuss the optical activity of lactic acid.

Concept: Proteins - Structure of Proteins
Chapter: [14.02] Proteins
[3]6.3

Write balanced chemical equations for action of potassium permanganate on: Hydrogen

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
Chapter: [7.01] Group 15 Elements

Write balanced chemical equations for action of potassium permanganate on Warm conc. sulphuric acid

 

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
Chapter: [7.01] Group 15 Elements

Explain why Mn2+ ion is more stable than Mn3+? (Given : Mn→ Z=25)

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
Chapter: [7.01] Group 15 Elements
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[3]6.4

What is effective atomic number (EAN.)?

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [0.09] Coordination Compounds [0.09] Coordination Compounds

Calculate EAN of cobalt (Z=27) in [CO(NH3)6]+3 and of zinc (Z=30) in [Zn(NH3)4]SO4.

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [0.09] Coordination Compounds [0.09] Coordination Compounds
[12]7 | Answer any SIX:
[2]7.1

What is a soap ?

Concept: Cleansing Agents - Soaps
Chapter: [16.03] Cleansing Agents

How soap is prepared?

Concept: Cleansing Agents - Soaps
Chapter: [16.03] Cleansing Agents
[2]7.2

Identify the compounds 'A' and 'B' in the following equation:

Concept: Amines - Preparation of Amines
Chapter: [0.13] Amines [13.01] Amines
[2]7.3

Write a note on the self oxidation-reduction reaction of an aldehyde with a suitable example.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Other Reactions
Chapter: [12.01] Aldehydes and Ketones
[2]7.4

Write names and chemical formulae of monomers used in preparing Buna-S.

Concept: Types of Polymerisation Reactions - Rubber
Chapter: [0.15] Polymers
[2]7.5

Define complex lipids

Concept: Proteins - Structure, Classification and Functions
Chapter: [14.02] Proteins

Mention 'two' functions of lipids

Concept: Proteins - Structure, Classification and Functions
Chapter: [14.02] Proteins
[2]7.6

Distinguish between SN1 and SN2 mechanisms.

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics
[2]7.7

What are lanthanoids?

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

What is the position of actinoids in periodic table ?

Concept: F-block Elements - The Actinoids
Chapter: [0.08] Transition and Inner Transition Elements [8.02] F-block Elements
[2]7.8

How is Methoxyethane prepared from : Methyl iodide

Concept: Ethers - Physical and Chemical Properties of ether
Chapter: [11.03] Ethers

How is Methoxyethane prepared from : Diazomethane

Concept: Ethers - Physical and Chemical Properties of ether
Chapter: [11.03] Ethers
[7]8 | Select and write the most appropriate answer from the given alternatives for each sub-question
[1]8.1

IUPAC name of K4[Fe(CN)6] is

 tetrapotassium ferrocyanide

potassium ferricyanide

potassium ferrocyanide

potassium hexacyanoferrate

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [0.09] Coordination Compounds
[1]8.2

Carbon atom in methyl carbocation contains how many pairs of electrons?

(a) 8

(b) 4

(c) 3

(d) 5

Concept: Ethers - Physical and Chemical Properties of ether
Chapter: [11.03] Ethers
[1]8.3

How many moles of acetic anhydride will be required to form glucose pentaacetate from 2M of glucose?

(a) 2

(b) 5

(c) 10

(d) 2.5

Concept: Carbohydrates - Structures of Glucose
Chapter: [14.01] Carbohydrates
[1]8.4

Identify the weakest base amongst the following :

(a) p- methoxyaniline

(b) o-toluidine

(c) benzene - 1, 4 - diamine

(d) 4 - aminobenzoic acid

Concept: Physical Properties of Amines
Chapter: [0.13] Amines [13.01] Amines
[1]8.5

Bakelite is the polymer of:

(a) Benzaldchyde and phenol

(b) Acetaldehyde and phenol

(c) Formaldehyde and phenol

(d) Formaldehyde and benzyl alcohol

 

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
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[1]8.6

Formalin is 40% aqueous solution of:

(a) Methanal

(b) Methanoic acid

(c) Methanol

(d) Methanamine

Concept: Uses of Aldehydes and Ketones
Chapter: [12.01] Aldehydes and Ketones
[1]8.7

Which among the following pairs of elements is 'not' an example of chemical twins?

Zr and Hf

Nb and Ta

Mo and W

Ta and Re

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