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Chemistry 2015-2016 HSC Science (General) 12th Board Exam Question Paper Solution

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Chemistry
2015-2016 March
Marks: 70

CHEMISTRY

(PHYSICAL AND INORGANIC CHEMISTRY)

Notes:

  1. All questions are compulsory.
  2. Answers of both the sections should be written in same answer book.
  3. Draw well labelled diagrams and write balanced equations wherever necessary.
  4. Figures to the right indicate full marks.
  5. Use of logarithmic table is allowed.
  6. Every new question must be started on a new page.

 


[12]1 | Answer any six of the following
[2]1.1

What is ferromagnetism?

Concept: Magnetic Properties
Chapter: [1] Solid State

Iron (z=26) is highly ferromagnetic. Explain.

Concept: Magnetic Properties
Chapter: [1] Solid State
[2]1.2

Define boiling point

Concept: Types of Solutions
Chapter: [2] Solutions and Colligative Properties

Write the formula to determine the molar mass of a solute using freezing point depresssion method.

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [2] Solutions and Colligative Properties
[2]1.3 | Write mathematical equation of first law of thermodynamics
[1]1.3.1

Write mathematical equation of first law of thermodynamics for Adiabatic process

Concept: Chemical Thermodynamics and Energetic - First Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.3.2

Write mathematical equation of first law of thermodynamics for Isochoric process

Concept: Chemical Thermodynamics and Energetic - First Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic
[2]1.4

Explain a graphical method to determine activation energy of a reaction.

Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [5] Chemical Kinetics
[2]1.5 | Write the names and chemical formulae
[1]1.5.1

Write the names and chemical formulae of any one ore of iron.

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]1.5.2

Write the names and chemical formulae of any one ore of zinc.

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[2]1.6

Define enthalpy of sublimation.

Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation
Chapter: [3] Chemical Thermodynamics and Energetic

How is enthalpy of sublimation related to enthalpy of fusion and enthalpy of vaporization?

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [3] Chemical Thermodynamics and Energetic
[2]1.7

What are Ellingham's diagrams? Write 2 features of it.

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

Write features of Ellingham's diagrams

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

Silver crystallises in FCC structure. If density of silver is 10.51 gcm-3, calculate the volume of unit cell.

[Atomic mass of slive (Ag) = 108 gm-1]

Concept: Calculations Involving Unit Cell Dimensions
Chapter: [1] Solid State
[3]2.2

The vapour pressure of pure benzene is 640mm og Hg. 2.175×10-3kg of non-vloatile solute is added to 39 gram of benzene the vapour pressure of solution is 600mm of HG. Calculate molar mass of solute.

[C = 12, H = 1]

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions and Colligative Properties
[3]2.3

Calculate C-Cl bond enthalpy from following reaction:

CH3Cl(g) + Cl2(g) → Ch2Cl2(g) + HCl(g) ΔH° = -104KJ

If C-H, Cl-Cl and H-Cl bond enthalpies are 414, 243 and 431 KJ-Mol-1 respectively.

Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation
Chapter: [3] Chemical Thermodynamics and Energetic
[3]2.4

Define cell constant.

Concept: Conductance of Electrolytic Solutions - Introduction
Chapter: [4] Electrochemistry

Draw a neat and well labelled diagram of primary reference electrode.

Concept: Galvanic Cells - Introduction
Chapter: [4] Electrochemistry
[7]3 | Answer any ONE of the following
[7]3.1
[2]3.1.1

Write four points of differences between properties of nitrogen and other elements of group 15.

Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[1]3.1.2

Explain the structure of ClF3

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [7.03] Group 17 Elements
[3]3.1.3

Conductivity of a solution is 6.23 x 10-5  Ω-1cm-1 and its resistance is 13710Ω. If the electrodes are 0.7cm apart, calculate the cross-sectional area of electrode.

Concept: Conductance of Electrolytic Solutions - Introduction
Chapter: [4] Electrochemistry
[1]3.1.4

Why is molality of a solution independent of temperature?

Concept: Expressing Concentration of Solutions
Chapter: [2] Solutions and Colligative Properties
[7]3.2
[1]3.2.1

What are neutral oxides?

Concept: P - Block Group 16 Elements - Simple Oxides
Chapter: [7.02] Group 16 Elements
[2]3.2.2

Explain the nature of zinc oxide with the help of the reactions.

Concept: P - Block Group 16 Elements - Simple Oxides
Chapter: [7.02] Group 16 Elements
[1]3.2.3

Define "Molar conductivity".

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [4] Electrochemistry
[1]3.2.4

Define "zero order reaction".

Concept: Factors Influencing Rate of a Reaction
Chapter: [5] Chemical Kinetics
[2]3.2.5

In a first order reaction x → y, 40% of the given sample of compound remains unreacted in 45 minutes. Calculate rate constant of the reaction.

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

Define "zero order reaction".

Concept: Factors Influencing Rate of a Reaction
Chapter: [5] Chemical Kinetics
[7]4 | Select and write the most appropriate answer from the given alternatives for each sub-question
[1]4.1

The molecular formula H2S2O2 represents which oxoacid?

  • Hydrosulphurous acid
  • Thiosulphurous acid
  • Sulphuric acid
  • Pyrosulphurous acid
Concept: P - Block Group 16 Elements - Oxoacids of Sulphur
Chapter: [7.02] Group 16 Elements
[1]4.2

Iodine exists as

  • polar molecular solid
  • ionic solid
  • nonpolar molecular solid
  • hydrogen bonded molecular solid
Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
Chapter: [7.03] Group 17 Elements
[1]4.3

Absolute entropies of solids, liquids and gases can be determined by

  • Measuring heat capacity of substance at various temperatures
  • Subtracting standard entropy of reactants from products
  • Measuring vibrational motion of molecules
  • Using formula ΔS° = ST° - SO°
Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [3] Chemical Thermodynamics and Energetic
[1]4.4

The determination of molar mass from elevation in boiling point is called as

  • cryoscopy
  • colorimetry
  • ebullioscopy
  • spectroscopy
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions and Colligative Properties
[1]4.5

The process of leaching alumina, using sodium carbonate is called

  • Bayer's process
  • Decomposition
  • Cyanide process
  • Hall's process
Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]4.6

On calculating the strength of current in amperes if a charge of 840C (coulomb) passes through an electrolyte in 7 minutes, it will be

  • 1
  • 2
  • 3
  • 4
Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
[1]4.7

A → B is a first order reaction with rate 6.6 × 10-5m-s-1. When [A] is 0.6m, rate constant of the reaction is

  • 1.1 × 10-5s-1
  • 1.1 × 10-4s-1
  • 9 × 10-5s-1
  • 9 × 10-4s-1
Concept: Factors Influencing Rate of a Reaction
Chapter: [5] Chemical Kinetics
[12]5 | Answer any SIX of the following
[2]5.1

Why is Sc3+ colourless while Ti3+ coloured? (Atomic number Sc = 21, Ti =22)

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[2]5.2

Illustrate with example, the difference between a double salt and a co-ordination compound

Concept: Coordination Compounds - Introduction
Chapter: [9] Coordination Compounds
[2]5.3

How is chlorobenzene prepared from aniline?

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

How is chlorobenzene converted into diphenyl/biphenyl?

Concept: Haloarenes - Reaction with Metals
Chapter: [10.02] Haloarenes
[2]5.4

What is metamerism? 

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11.01] Alcohols [11.02] Phenols [11.03] Ethers

Explain metamerism with suitable examples of ethers

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[2]5.5

What are ketones? 

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [12.01] Aldehydes and Ketones

How are ketones classified?

Concept: Aldehydes and Ketones - Nomenclature
Chapter: [12.01] Aldehydes and Ketones
[2]5.6

How is 1-nitropropane prepared from suitable oxime?

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond
Chapter: [12.02] Carboxylic Acids

How are  2 - nitropropane prepared from suitable oxime?

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond
Chapter: [12.02] Carboxylic Acids
[2]5.7

Define antioxidants?

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

Draw structure of BHT.

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16.02] Chemicals in Food
[2]5.8

Define carbohydrates.

Concept: Introduction of Carbohydrates
Chapter: [14.01] Carbohydrates

Write the reaction for the preparation of Nylon-6.

Concept: Polymers - Nylon 6
Chapter: [15] Polymers
[9]6 | Answer any THREE of the following
[3]6.1

What are f-block elements? 

Concept: F-block Elements - General Indroduction
Chapter: [8.02] F-block Elements

Distinguish between lanthanoid and actinoids.

Concept: F-block Elements - The Actinoids
Chapter: [8.02] F-block Elements
[3]6.2
[1]6.2.1

Explain  Optical activity

Concept: Werner’S Theory of Coordination Compounds
Chapter: [9] Coordination Compounds
[1]6.2.2

Explain  Ligand

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[1]6.2.3

Explain Interstitial compounds

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[3]6.3

Write the formula of Tetraminodichloroplatinum (IV) chloridex.

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

 How is propene converted into 1- bromopropane and 2 - bromopropane?

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes
[3]6.4

What are broad-spectrum antibiotics?

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

How are polythene and neoprene prepared?

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [15] Polymers
[7]7 | Answer any ONE of the following :
[7]7.1

Explain the mechanism of esterification

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of C-OH Bond
Chapter: [12.02] Carboxylic Acids

Write the reactions involved in dehydration of 1°, 2° and 3° alcohols.

Concept: Alcohols - Mechanism of Dehydration of Alcohols
Chapter: [11.01] Alcohols
[7]7.2

What are vitamins?

Concept: Introduction of Vitamins
Chapter: [14.03] Vitamins

Name any two diseases caused by deficiency of Vitamin A

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

Write the structure of a nucleoside

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

Write the structure of a nucleotide

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

How are 1 - nitropropane, 2-nitropropane and 2-methyl 2- nitropropane are distinguished from each other using nitrous acid?

Concept: Amines - Identification of Primary, Secondary and Tertiary Amines
Chapter: [13.01] Amines
[7]8 | Select and write the most appropriate answers from the given alternatives
[1]8.1

The preparation of alkyl fluoride from alkyl chloride, in presence of metallic fluorides is known as

(a) Williamson’s reaction                                 

(b) Finkelstein reaction

(c) Swarts reaction

(d) Wurtz reaction

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes
[1]8.2

Identify the weakest acidic compound amongst the following

(a) p-nitrophenol                 

(b) p-chlorophenol

(c) p-cresol                         

(d) p-raminophenol

Concept: Phenols - Physical and Chemical Properties
Chapter: [11.02] Phenols
[1]8.3

On acid hydrolysis, propane nitrile gives

(a) propanal                       

(b) acetic acid

(c) propionamide

(d) propanoic acid

Concept: Carboxylic Acids - Methods of Preparation of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
[1]8.4

Which of the following amines yields foul smelling product with holoform and alcoholic KOH?

(a)    Ethyl amine                   

(b)   Diethyl amine

(c)    Triethyi amine               

(d)  Ethyl methyl amine

Concept: Amines - Chemical Reactions of Amines - Carbylamine Reaction
Chapter: [13.01] Amines
[1]8.5

Which of the following NOT present in DNA?

(a)  adenine                        

(b) Guanine

(c) Thymine

(d) Uracil

Concept: Introduction of Nucleic Acids
Chapter: [14.04] Nucleic Acids
[1]8.6

Amongst the followings, identify a copolymer?

(a) Orion                            

(b) PVC

(c) PHBV

(d) Teflon

Concept: Types of Polymerisation Reactions - Copolymerisation
Chapter: [15] Polymers
[1]8.7

Phenelzine is used as an

(a)  analgesic                      

(b) antiseptic

(c) antipyretic

(d) antidepressant

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

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