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Chemistry 2014-2015 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Chemistry
2014-2015 March
Marks: 70

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

p - type semi-conductors are made by mixing silicon with impurities of-

  1. germanium
  2. boron
  3. arsenic  
  4. antimony
Concept: Electrical Properties - Applications of N-type and P-type Semiconductors
Chapter: [1] Solid State
[1]1.2

Amongst the following identify the criterion for a process to be at equilibrium -

  1. ΔG < 0
  2. ΔG > 0
  3. ΔStotal=0
  4. ΔS < 0
Concept: Chemical Thermodynamics and Energetic - Equilibrium Constant
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.3

Colligative property depends only on ........................ in a solution.

  1. Number of solute particles.
  2. Number of solvent particles.
  3. Nature of solute particles.
  4. Nature of solvent particles.
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions and Colligative Properties
[1]1.4

The charge of how many coulomb is required to deposit 1.0 g of sodium metal (molar mass 23.0 g mol-1) from sodium ions is -

  1. 2098
  2. 96500
  3. 193000
  4. 4196
Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
[1]1.5

What is the chemical composition of malachite?

  1. CuO . CuC03
  2. Cu(OH)2 CuC03
  3. CuO.Cu(OH)2         
  4. Cu2O . Cu(OH)2
Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]1.6

The element that does NOT exhibit allotropy is

  1. As
  2. Sb
  3. Bi
  4. N
Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[1]1.7

The integrated rate equation for first order reaction is A → products

(a) `k=2.303t log_10([A]_@/[A]_t)`

(b) `k=-1/tl_n[A]_t/[A]_0`

(c) `k=2.303/t log_10 ([A]_t/[A]_0 )`

(d) `k=1/tl_n[A]_t/[A]_0`

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[12]2 | Answer any SIX of the following
[2]2.1

Define the Enthalpy of fusion

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

Define the Enthalpy of atomization

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [3] Chemical Thermodynamics and Energetic
[2]2.2

Derive van’t Hoff general solution equation

Concept: Abnormal Molar Masses
Chapter: [2] Solutions and Colligative Properties
[2]2.3

Explain impurity defect in stainless steel with diagram

Concept: Imperfections in Solids - Introduction
Chapter: [1] Solid State
[2]2.4

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

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[2]2.5

Draw neat and labelled diagram of dry cell.

Concept: Batteries - Primary Batteries
Chapter: [4] Electrochemistry
[2]2.6

Explain the structure of sulphur dioxide.

Concept: P - Block Group 16 Elements - Sulphur Dioxide
Chapter: [7.02] Group 16 Elements
[2]2.7

What is calcination?

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

Explain calcination with reactions.

Concept: Oxidation Reduction
Chapter: [6] General Principles and Processes of Isolation of Elements
[2]2.8

Arrange the following reducing agents in the order of increasing strength under standard state conditions. Justify the answer 

Element

Al(s)

Cu(s)

Cl(aq)

Ni(s)

 

Eo

-1.66V

0.34V

1.36V

-0.26V

 

Concept: Galvanic Cells - Introduction
Chapter: [4] Electrochemistry
[9]3 |  Answer any THREE of the following
[3]3.1

Determine whether the reactions with the following ΔH and ΔS values are spontaneous or non-spontaneous. State whether the reactions are exothermic or endothermic.

(a) ΔH = -110kJ, ΔS = + 40JK-1 at 400 K

(b) ΔH = + 40kJ, ΔS = -120JK-1 at 250K

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [3] Chemical Thermodynamics and Energetic
[3]3.2

1.0 x10-3Kg of urea when dissolved in 0.0985 Kg of a solvent, decreases freezing point of the solvent by 0.211 k. 1.6x10 Kg of another non-electrolyte solute when dissolved in 0.086 Kg of the same solvent depresses the freezing point by 0.34 K. Calculate the molar mass of the another solute. (Given molar mass of urea = 60)

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [2] Solutions and Colligative Properties
[3]3.3

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t1/2= 3 hours. What fraction of the sample of sucrose remains after 8 hours?

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[3]3.4

Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.

Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[7]4 | Answer any one of the following :
[7]4.1

Niobium crystallises as body centred cube (BCC) and has density of 8.55 Kg / dm-3 . Calculate the attomic radius of niobium.

(Given : Atomic mass of niobium = 93).

 

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

Write one statement of first law of thermodyamics and its mathematical expression.

Concept: Chemical Thermodynamics and Energetic - First Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic

Write the reactions involved in th'e zone of reduction in blast furnace during extraction of iron.

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[7]4.2

Write molecular formulae and structures of Dithionic acid

Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
Chapter: [7.02] Group 16 Elements

Write molecular formulae and structures of the Peroxy monosulphuric acid

Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
Chapter: [7.02] Group 16 Elements

Write molecular formula and structure of Pyrosulphuric acid 

Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
Chapter: [7.02] Group 16 Elements

Write molecular formulae and structures of the Dithionous acid

Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
Chapter: [7.02] Group 16 Elements

Calculate E and AG for the following at 28°C:

Mg(s) + Sn2+(0.04M) → Mg2+(0.06M) + Sn(s)

Ecell = 2.23V

Is the reaction spontaneous?

Concept: Galvanic Cells - Introduction
Chapter: [4] Electrochemistry
[7]5 | Select and write the most appropriate answers from the given alternatives for each sub-question
[1]5.1

Identify the product ‘D’ in the following sequence of reactions:

`H3C-CH2-CH2-Cl (Alc)/(KOH)'B'(HBr)/()'C'(Na)/(Ether)’D'`

  1. 2,2 - dimethyl butane  
  2. 2,3- dimethylbutane
  3. hexane                           
  4. 2,4 - dimethylpentane
Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Elimination Reactions
Chapter: [10.01] Haloalkanes
[1]5.2

Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate?

  1. [Cr(NH3)4SO4] Cl
  2. [Co(NH3)4Cl2] NO2
  3. [Cr(NH3)4Cl2]SO4
  4. [CrCl2(H2O)4]Cl
Concept: Bonding in Coordination Compounds - Colour in Coordination Compounds
Chapter: [9] Coordination Compounds
[1]5.3

What is the geometry of chromate ion?

  1. Tetrahedral                    
  2. Octahedral
  3. Trigonal planer              
  4. Linear
Concept: D-block Elements - Some Important Compounds of Transition Elements
Chapter: [8.01] D-block Elements
[1]5.4

Primary and secondary nitroalcanes containing α - H atom show property of -

  1. chain isomerism
  2. tautomerism
  3. optical isomerism
  4. geometrical isomerism
Concept: Amines - Identification of Primary, Secondary and Tertiary Amines
Chapter: [13.01] Amines
[1]5.5

In phenol carbon atom attached to -OH group undergoes -

  1. SP3 hybridisation          
  2. SP hybridisation
  3. SP2 hybridisation
  4. No hybridisation
Concept: Phenols - Physical and Chemical Properties
Chapter: [11.02] Phenols
[1]5.6

Identify the strongest acid amongst the followings:

  1. Chloroacetic acid          
  2. Acetic acid
  3. Trichloroacetic acid
  4. Dichloroaceticacid
Concept: Physical Properties of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
[1]5.7

Which of the following vitamins is water soluble?

  1. A
  2. D
  3. E
  4. B
Concept: Vitamins - Classification of Vitamins
Chapter: [14.03] Vitamins
[12]6 | Answer any SIX of the following :
[2]6.1

Write a note on Friedel Craft’s acylation.

Concept: Haloarenes - Electrophilic Substitution Reactions
Chapter: [10.02] Haloarenes
[2]6.2

How is ethyl amine prepared from methyl iodide?

Concept: Amines - Preparation of Amines
Chapter: [13.01] Amines
[2]6.3

What are antibiotics? Give ‘two’ examples

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[2]6.4

Explain, why are boiling points of carboxylic acids higher than corresponding alcohols

Concept: Physical Properties of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
[2]6.5

How are proteins classified on the basis of molecular shapes?

Concept: Proteins - Structure of Proteins
Chapter: [14.02] Proteins
[2]6.6

Explain Interstitial compounds

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

Why do interstitial compounds have higher melting points than corresponding pure metals?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[2]6.7

Write the structures and IUPAC names of the :Adipic acid compound

Concept: Carboxylic Acids - Nomenclature
Chapter: [12.02] Carboxylic Acids

Write the structures and IUPAC names of the α - methyl butyraldehyde.

Concept: Aldehydes and Ketones - Nomenclature
Chapter: [12.01] Aldehydes and Ketones
[2]6.8

Explain with examples, branched and linear polymers.

Concept: Introduction of Polymers
Chapter: [15] Polymers
[9]7 | Answer any THREE of the following :
[3]7.1

On the basis of valence bond theory explain the nature of bonding in [CoF6]3 ion.

 

Concept: Bonding in Coordination Compounds - Valence Bond Theory (VBT)
Chapter: [9] Coordination Compounds

Write the IUPAC name of [Co(N02)3(NH3)3].

Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Chapter: [9] Coordination Compounds
[3]7.2

Define lanthanoid contraction.

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

Explain effects of lanthanoid contraction

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

What are the consequences of lanthanoid contraction?

Concept: F-block Elements - The Lanthanoids
Chapter: [8.02] F-block Elements
[3]7.3

Write mechanism of Aldol addition reaction.

Concept: Aldehydes and Ketones - Reactivity of Alpha Hydrogen in Aldehydes
Chapter: [12.01] Aldehydes and Ketones
[3]7.4

Define carbohydrates.

Concept: Introduction of Carbohydrates
Chapter: [14.01] Carbohydrates

What are reducing and non-reducing sugars?

Concept: Classification of Carbohydrates
Chapter: [14.01] Carbohydrates
[7]8 | Answer any ONE of the following
[7]8.1

Write a note on Gabriel phthalimide synthesis.

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

What are biodegradable polymers and non-biodegradable polymers? Write ‘one example’ of each.

Concept: Introduction of Polymers
Chapter: [15] Polymers

Explain cationic detergents.

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

How is carbolic acid prepared from the given compounds :

Aniline

Concept: Phenols - Methods of Preparation
Chapter: [11.02] Phenols

How is carbolic acid prepared from the given compounds :

Chlorobenzene and steam at 698K?

Concept: Phenols - Methods of Preparation
Chapter: [11.02] Phenols

Draw structure of DDT.

Concept: Polyhalogen Compounds
Chapter: [10.02] Haloarenes

Write the environmental effects of DDT.

Concept: Polyhalogen Compounds
Chapter: [10.02] Haloarenes

Mention ‘two’ physical properties of carbolic acid.

Concept: Phenols - Physical and Chemical Properties
Chapter: [11.02] Phenols

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