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Chemistry 2012-2013 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Chemistry
Marks: 70Academic Year: 2012-2013
Date: March 2013

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

In body centred cubic structure the space occupied is about

(A) 68%                                                     (B) 53%

(C) 38%                                                     (D) 32%

Concept: Packing Efficiency - Efficiency of Packing in Body-centred Cubic Structures
Chapter: [0.01] Solid State
[1]1.2

For a gaseous reaction the unit of rate of reaction is

(A) L atm s-1

(B) atm mol-1 s-1

(C) atm s1

(D) mol s

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[1]1.3

Which of the following compounds contain S = O as well as S = S bonds?

(A) Sulphuric acid

(B) Thiosulphuric acid

(C) Sulphurous acid

(D) Thiosulphurous acid

 

Concept: P - Block Group 16 Elements - Compounds of Sulphur
Chapter: [7.02] Group 16 Elements
[1]1.4

Which of the following solutions shows maximum depression in freezing point?

(A) 0.5 M Li2SQ4

(B) 1 M NaCl

(C) 0.5 M A12(SO4)3

(D) 0.5 MBaC12

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [0.02] Solutions and Colligative Properties
[1]1.5

For a chemical reaction dS=0.035 kJ/k and dH=20kJ. At what temperature does the reaction turn nonspontaneous?

5.14 K

57.14 K

571.4 K

5714.0 K

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [0.03] Chemical Thermodynamics and Energetic
[1]1.6

The standard e.m.f of the following cell is 0.463 V

`Cu|Cu_(1m)^(++)`

What is the standard potential of Cu electrode?

(A) 1.137 V

(B) 0.337 V

(C) 0.463 V

(D) - 0.463 V

Concept: Galvanic Cells - Introduction
Chapter: [0.04] Electrochemistry
[1]1.7

Fe2O3 is reduced to spongy iron near the top of blast furance by

(A) H2

(B) CaO

(C) SiO2

(D) CO

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[12]2 | (A) Answer any SIX of the following
[2]2.1

Distinguish between crystalline solid and amorphous solid

Concept: Types of Solids
Chapter: [0.01] Solid State
[2]2.2

State Kohlrausch Law

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [0.04] Electrochemistry

Write mathematical expression of molar conductivity of the given solution at infinite dilution.

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [0.04] Electrochemistry
[2]2.3

Write cell reaction in lead storage battery during discharge.

Concept: Batteries - Primary Batteries
Chapter: [0.04] Electrochemistry
[2]2.4

Draw structure and write geometry of PCl3 and PCl5.

Concept: P - Block Group 15 Elements - Compounds of Phosphorus
Chapter: [7.01] Group 15 Elements
[2]2.5

Prove that ΔH=ΔU+ΔnRT. what is the condition under which ΔU=ΔH?

Concept: Chemical Thermodynamics and Energetic - First Law of Thermodynamics
Chapter: [0.03] Chemical Thermodynamics and Energetic
[2]2.6

Mention names and formulae of two ores of alumunium.

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[2]2.7

Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.

Concept: Colligative Properties and Determination of Molar Mass - Relative Lowering of Vapour Pressure
Chapter: [0.02] Solutions and Colligative Properties
[2]2.8

What is pseudo first order reaction? Give one· example of it.

Concept: Factors Influencing Rate of a Reaction
Chapter: [0.05] Chemical Kinetics
[9]3 | Answer any THREE of the following:
[3]3.1

Calculate the mole fraction and molality of HNO3 in solution contaning 12.2%HNO3 (Given atomic mases:H=1, N=13,O=16)

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [0.02] Solutions and Colligative Properties
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[3]3.2
 

Consider the reaction

`3I_((aq))^-) +S_2O_8^(2-)->I_(3(aq))^-) + 2S_2O_4^(2-)`

At particular time t, `(d[SO_4^(2-)])/dt=2.2xx10^(-2)"M/s"`

What are the values of the following at the same time?

a. `-(d[I^-])/dt`

b. `-(d[S_2O_8^(2-)])/dt`

c. `-(d[I_3^-])/dt`

 

 
Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [0.05] Chemical Kinetics
[3]3.3

300 M mol of perfect gas occupies 13 L at 320 K. Calculate the work done in joules when the gas expands-

(a) isothermally against a Constant external pressure of 0.20atm.

(b) isothermal and reversible process.

(c) into vaccum until the volume of gas is increased by 3L (R=8.314J mol-1 K-1)

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [0.03] Chemical Thermodynamics and Energetic
[3]3.4

What is the action of Excess of air on ammonia ?

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

What is the action of Excess of chlorine on ammonia?

 

 

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

What is the action of Na Metal on ammonia? 

Concept: P - Block Group 15 Elements - Ammonia
Chapter: [7.01] Group 15 Elements
[7]4 | Answer any one of the following
[7]4.1
[2]4.1.1 | Explain with reason sign conventions of ΔS in the following reactions:
[1]4.1.1.1

Explain with reason sign conventions of ΔS in the following reaction

N2(g) + 3H2(g) → 2NH3(g)

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[1]4.1.1.2

Explain with reason sign conventions of ΔS in the following reaction

CO2(g) → CO2(g)

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[2]4.1.2 | Explain the following terms
[1]4.1.2.1

Explain the following term

Smelting

Concept: General Principles and Processes of Isolation of Elements - Principles and Methods of Extraction - Concentration
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[1]4.1.2.2

Explain the following term

Flux

Concept: General Principles and Processes of Isolation of Elements - Principles and Methods of Extraction - Concentration
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[3]4.1.3

Gold occurs as face centred cube and has a density of 19.30 kg dm-3. Calculate atomic radius of gold (Molar mass of Au = 197)

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[7]4.2

a. Explain the trends in the following properties with reference to group 16:

1 Atomic radii and ionic radii

2 Density

3 ionisation enthalpy

4 Electronegativity

b. In the electolysis of AgNO3 solution 0.7g of Ag is deposited after a certain period of time. Calulate the quantity of electricity required in coulomb. (Molar mass of Ag is 107.9g mol-1)

 

Concept: Concept of Group 16 Elements
Chapter: [7.02] Group 16 Elements

Define Osmosis

Concept: Concept of Group 16 Elements
Chapter: [7.02] Group 16 Elements
[7]5 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]5.1

ln which pair highest oxidation states of transition metals are found:

nitriles and chlorides

fluorides and chlorides

fluorides and oxides

nitriles and oxides

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[1]5.2

which of the following carbocations is least stable?

(A) 

(B)

(C)

(D)

 

 

Concept: Haloalkanes and Haloarenes - Nature of C-x Bond
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[1]5.3

Compound having general formula is called

(A) diester

(B) acid anhydride

(C) hemiacetal

(D) acetal

Concept: Aldehydes and Ketones - Nomenclature
Chapter: [12.01] Aldehydes and Ketones
[1]5.4
 

The complex ion `[Co(H_2O)_5 (ONO)]^(2+) `

(A) linkage isomer

(B) ionisation isomer

(C) co-ordination isomer

(D) geometrical isomer

 
Concept: Isomerism in Coordination Compounds - Structural Isomerism
Chapter: [0.09] Coordination Compounds
[1]5.5

Inflammation of the tongue is due to the deficiency of:

Vitamin B1

Vitamin B2

Vitamin B5

Vitamin B6

Concept: Vitamins - Important Vitamins, Their Sources and Their Deficiency Diseases
Chapter: [14.03] Vitamins
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[1]5.6

Identify the compound 'B' in the following series of reaction:

(A) n-propyl chloride

(B) Propanamine

(C) n-propyl alcohol

(D) Isoproply alcohol

Concept: Alcohols - Methods of Preparation
Chapter: [11.01] Alcohols
[1]5.7

Which of the following reagents is best for the following conversion?

(A) LiAlH4

(B) 

(C) H2/Ni, 453 K

(D) Zn-Hg+HCl(con)

Concept: Alcohols - Methods of Preparation
Chapter: [11.01] Alcohols
[12]6 | Answer any SIX ofthe following
[2]6.1

Calculate magnetic moment of  `Fe_((aq))^(2+) ion (Z=26).`

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[2]6.2

How is ethanol prepared from methanal by using Grignard reagent?

Concept: Alcohols - Methods of Preparation
Chapter: [11.01] Alcohols
[2]6.3

Write the chemical reaction to prepare novolac polymer.

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
[2]6.4

Why does p-nitrochlorobenzene undergo displacement reactions readily with attack of nucleophilic HOΘ ion?

Concept: Haloarenes - Nucleophilic Substitution
Chapter: [10.02] Haloarenes
[2]6.5

What is the action of bromine in alkaline medium on

i. CH3CH2NO2

ii. 

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes
[2]6.6

Define antioxidants?

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16.02] Chemicals in Food
[2]6.7

How is 4-methylpent-3-en-2-one obtained from propan-2-one?

Concept: Aldehydes and Ketones - Reactivity of Alpha Hydrogen in Aldehydes
Chapter: [12.01] Aldehydes and Ketones
[2]6.8

What are hormones?

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

Write the structure of simple triglycerides.

Concept: Proteins - Structure, Classification and Functions
Chapter: [14.02] Proteins
[9]7 | Answer any THREE of the following
[3]7.1

Write the different oxidation states of manganese.

Concept: Electronic Configurations of the D-block Elements
Chapter: [8.01] D-block Elements

Why +2 oxidation state of manganese is more stable?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[3]7.2

How are the following compounds prepared?

benzaldehyde from benzene

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

How are the following compounds prepared?

acetophenone from benzene

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

How are the following compounds prepared?

benzaldehyde from benzoyl chloride

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[3]7.3

Write the structure of a nucleotide

Concept: Introduction of Nucleic Acids
Chapter: [14.04] Nucleic Acids

Write the structure of a nucleoside

Concept: Introduction of Nucleic Acids
Chapter: [14.04] Nucleic Acids

Define complex lipids

Concept: Proteins - Structure, Classification and Functions
Chapter: [14.02] Proteins
[3]7.4

Write the fomulae of the following compounds

Sodium hexanitrito- N - cobaltate (III)

Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
Chapter: [0.09] Coordination Compounds

Write the fomulae of the following compounds :

Tetraaquodichlorochromium (III) chloride

 

Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
Chapter: [0.09] Coordination Compounds

Write the fomulae of the following compounds

Potassium tetracyanoaurate (III) ion

Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
Chapter: [0.09] Coordination Compounds
[7]8 | Answer any ONE of the following
[7]8.1

Explain the following term: Homopolymers

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

Explain the following term: Elastomers

Concept: Introduction of Polymers
Chapter: [0.15] Polymers

Explain the mechanism of cleansing action of soaps.

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

Write balanced chemical equations for the action of phosphorous trichloride on propan-2-ol

Concept: Introduction of Polymers
Chapter: [0.15] Polymers

Write balanced chemical equations for the action of hydrogen bromide on styrene in the presence of a peroxide

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

Write balanced chemical equations for the action of methyl bromide on silver propanoate

Concept: Cleansing Agents - Soaps
Chapter: [16.03] Cleansing Agents
[7]8.2

Write a short note on Hoffmann bromamide degradation.

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

Explain the mechanism of action of hydroiodic acid on 3-methylbutan-2-ol.

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

Mention 'two' uses of propan-2-one.

Concept: Amines - Preparation of Amines
Chapter: [0.13] Amines [13.01] Amines
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Maharashtra State Board previous year question papers 12th Board Exam Chemistry with solutions 2012 - 2013

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