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Chemistry 2017-2018 HSC Science (Electronics) 12th Board Exam Question Paper Solution

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Chemistry
2017-2018 March
Marks: 70

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

The process in which the value of ΔU = 0 is __

(a) Adiabatic

(b) Isothermal

(c) Isobaric

(d) Isochoric

Concept: Chemical Thermodynamics and Energetic - Types of Systems
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.2

An ionic crystal lattice has `r^+/r` radius ratio of 0.320, its coordination number is __

(a) 3

(b) 4

(c) 6

(d) 8

Concept: Crystal Lattices and Unit Cells - Introduction
Chapter: [1] Solid State
[1]1.3

In the hydrogen-oxygen fuel cell, the carbon rods are immersed in the hot aqueous solution of __

(a) KCl

(b) KOH

(c) H2SO4

(d) NH4Cl

Concept: Batteries - fuel cell
Chapter: [4] Electrochemistry
[1]1.4

The chemical formula of willemite is __

(a) ZnS

(b) ZnCO3

(c) ZnO

(d) Zn2SiO4

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]1.5

The oxidation state of nitrogen in dinitrogen trioxide is ____

(a) + 1

(b) + 2

(c) + 3

(d) + 4

Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[1]1.6

Which of the following 0.1 M will aqueous solutions exert highest osmotic pressure?

(a) `Al_2(SO_4)_3`

(b) `Na_2SO_4`

(c) `MgCl_2`

(d) KCl

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions and Colligative Properties
[1]1.7

The half-life period of zero order reaction A → product is given by

(a) `([A]_0)/k`

(b) `0.693/k`

(c) `[A]_0/(2k)`

(d) `(2[A]_0)/k`

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[12]2 | Attempt Any Six of Following
[2]2.1

Derive the relation between the elevation of boiling point and molar mass of solute.

Concept: Colligative Properties and Determination of Molar Mass - Elevation of Boiling Point
Chapter: [2] Solutions and Colligative Properties
[2]2.2

State Third law of thermodynamics

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

Give two uses of the Third law of thermodynamics.

Concept: Chemical Thermodynamics and Energetic - Second and Third Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic
[2]2.3

Draw a neat and labelled diagram of the lead storage battery.

Concept: Galvanic Cells - Introduction
Chapter: [4] Electrochemistry
[2]2.4

Explain Ionic solids are hard and brittle.

Concept: Classification of Crystalline Solids
Chapter: [1] Solid State
[2]2.5

A certain reaction occurs in the following steps -

`Cl_(g) + O_(3(g)) -> ClO_((g)) + O_(2(g))`

`ClO_((g)) + O_((g)) -> Cl_((g)) + O_(2(g))`

a) What is the molecularity of each of the elementary steps?

b) Identify the reaction intermediate and write the chemical equation for overall reaction.

Concept: Rate of a Chemical Reaction
Chapter: [5] Chemical Kinetics
[2]2.6

Define Semipermeable membrane

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions and Colligative Properties

Define Reference electrode

Concept: Galvanic Cells - Introduction
Chapter: [4] Electrochemistry
[2]2.7

What is the action of chlorine on CS2

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [7.03] Group 17 Elements

What is the action of chlorine on Excess NH3

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [7.03] Group 17 Elements
[2]2.8

Write the chemical equations involved in van Arkel method for refining zirconium metal.

Concept: Refining
Chapter: [6] General Principles and Processes of Isolation of Elements
[9]3 | Answer any THREE of the following
[3]3.1

Write balanced chemical equations for Phosphorus reacts with magnesium

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

Write balanced chemical equations for Flowers of sulphur boiled with calcium hydroxide

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

Write balanced chemical equations for Action of ozone on hydrogen peroxide.

Concept: P - Block Group 15 Elements - Compounds of Phosphorus
Chapter: [7.01] Group 15 Elements
[3]3.2

The density of iron crystal is 8.54-gram cm–3. If the edge length of the unit cell is 2.8 A° and atomic mass is 56-gram mol–1, find the number of atoms in the unit cell.  (Given: Avogadro's number = 6.022x1023,1A° = 1x10-8 cm)

Concept: Concept of Close Packed Structures
Chapter: [1] Solid State
[3]3.3

How many faradays of electricity are required to produce 13 gram of aluminium from aluminium chloride solution? (Given: Molar mass of Al = 27.0-gram mol–1)

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
[3]3.4

Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol-1.

(Given: R = 8.314 J K-1 mol-1)

Concept: Chemical Thermodynamics and Energetic - First Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic
[7]4 | Attempt Any One
[7]4.1

Define the Enthalpy of atomization

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

Define Enthalpy of vaporization

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

Draw the structure of IF7. Write its geometry and the type of hybridization.

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

State Henry’s law.

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

22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution. (Given: a Molar mass of urea = 60 gram mol-1)

Concept: Expressing Concentration of Solutions
Chapter: [2] Solutions and Colligative Properties
[7]4.2

What is the action of carbon on the following metal oxides:

Fe2O3 in the blast furnace

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

What is the action of carbon on the following metal oxides :

ZnO in the vertical retort furnace

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

Write the molecular and structural formulae of Thiosulphuric acid

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

Write the molecular and structural formulae of Dithionous acid

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

The reaction A + B → products is first order in each of the reactants

1) How does the rate of reaction change if the concentration of A is increased by factor 3?

2) What is the change in the rate of reaction if the concentration of A is halved and concentration of B is doubled?

Concept: Rate of a Chemical Reaction
Chapter: [5] Chemical Kinetics
[7]5 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]5.1

A polymer used in paints is

(a) Nomex

(b) Thiokol

(c) Saran

(d) Glyptal

Concept: Introduction of Polymers
Chapter: [15] Polymers
[1]5.2

The number of primary and secondary hydroxyl groups in ribose are -

(a) 1, 3

(b) 2, 3

(c) 3, 1

(d) 3, 2

Concept: Classification of Carbohydrates
Chapter: [14.01] Carbohydrates
[1]5.3

The ligand diethylene triamine is -

(a) monodentate

(b) bidentate

(c) tridentate

(d) tetradentate

Concept: Bonding in Coordination Compounds - Introduction
Chapter: [9] Coordination Compounds
[1]5.4

Propene on oxidation with diborane in presence of alkaline hydrogen peroxide gives

(a) propane-1- ol

(b) propane-2-ol

(c) allyl alcohol

(d) propane-1, 2-diol

 

Concept: Alcohols - Methods of Preparation
Chapter: [11.01] Alcohols
[1]5.5

Baeyer’s reagent is -'

(a) acidified potassium dichromate

(b) alkaline potassium dichromate

(c) alkaline potassium permanganate

(d) acidified potassium permanganate

Concept: D-block Elements - General Indroduction
Chapter: [8.01] D-block Elements
[1]5.6

Identify 'A' in the following reaction -

(a) 2- Bromo-2 methylbutane

(b) 1 -Bromo-2,2-dimethylpropane

(c) 1 - Bromo - 3 -methylbutane

(d) 1 - Bromo- 2 -methylpropane

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10.01] Haloalkanes
[1]5.7

An antifertility drug is -

(a) Novestrol

(b) Histamine

(c) Vernal

(d) Equanil

Concept: Chemicals in Medicines - Antipyretic, Antimalarial and Antifertility
Chapter: [16.01] Chemicals in Medicines
[12]6 | Answer any SIX of the following
[2]6.1

Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
 in basic medium.

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

Explain the geometry of `[Co(NH_3)_6]^(3+)` on the basis of hybridisation. (Z of Co = 27)

Concept: Bonding in Coordination Compounds - Valence Bond Theory (VBT)
Chapter: [9] Coordination Compounds
[2]6.3

Why ethanol has the higher boiling point than ethane?

Concept: Classification of Alcohols and Phenols
Chapter: [11.01] Alcohols
[2]6.4

Write only reactions for the preparation of benzophenone from benzonitrile.

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [12.01] Aldehydes and Ketones
[2]6.5

What is the action of p-toluenesulphonychloride on ethylamine and diethylamine?

Concept: Amines - Nomenclature
Chapter: [13.01] Amines
[2]6.6

What are amino acids?

Concept: Proteins - Amino Acids
Chapter: [14.02] Proteins

Write the correct reaction for formation of the peptide bond between amino acids

Concept: Proteins - Amino Acids
Chapter: [14.02] Proteins
[2]6.7

Explain the term Antiseptics

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

Define antioxidants?

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16.02] Chemicals in Food
[2]6.8

Explain only reaction mechanism for alkaline hydrolysis of tert-butyl bromide

Concept: Haloarenes - Electrophilic Substitution Reactions
Chapter: [10.02] Haloarenes
[9]7 | Answer any THREE of the following
[3]7.1

Complete and rewrite the balanced chemical equations

Concept: Haloalkanes and Haloarenes - Nomenclature
Chapter: [10.01] Haloalkanes

Complete and rewrite the balanced chemical equations

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

Complete and rewrite the balanced chemical equations

Butanone + 2, 4-dinitro-phenylhydrazine 

Concept: Chemical Properties and Reactions of Carboxylic Acid
Chapter: [12.02] Carboxylic Acids
[3]7.2

How carbolic acid is prepared from benzene sulphonic acid?

Concept: Phenols - Phenols
Chapter: [11.02] Phenols

Write a chemical equation for the action of neutral ferric chloride on phenol.

Concept: Classification of Alcohols and Phenols
Chapter: [11.01] Alcohols
[3]7.3

Explain the preparation and uses of nylon-2-nylon-6.

Concept: Polymers - Nylon 6
Chapter: [15] Polymers
[3]7.4

How is glucose prepared from cane sugar?

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

Write the formula of the complex copper (II) hexacyanoferrate (II).

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates
[7]8 | Attempt Any One
[7]8.1

What is Lanthanoid contraction?

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

Explain the cause of Lanthanoids contraction.

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

Draw the structures of chloroxylenol

Concept: Chemicals in Medicines - Antiseptic and Disinfectants
Chapter: [16.01] Chemicals in Medicines

Draw the structures of adenine.

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

How are ethylamine and ethyl methyl amine distinguished by using nitrous acid?

Concept: Amines - Nomenclature
Chapter: [13.01] Amines
[7]8.2

What is the action of the following reagents on ethanoic acid?

1) `LiAlH_4"/"H_3O^+`

2) `PCl_2 , "heat"`

3) `P_2O_5, "heat"`

 

 

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

Identify 'A' and 'B' in the following reaction and rewrite the complete reaction :

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

Write a short note on Hoffmann bromamide degradation.

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

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