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

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Chemistry
2015-2016 July
Marks: 70

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

Schottky defects are observed in which solid among the following?

(a) Brass

(b) Cesium Chloride

(c) Zinc sulphide

(d) Stainless steel

Concept: Imperfections in Solids - Introduction
Chapter: [1] Solid State
[1]1.2

No machine has an efficiency unity', is stated in-

(a) first law of thermodynamics

(b) second law of thermodynamics

(c) third law of thermodynamics

(d) Hess' law of constant heat summation

Concept: Chemical Thermodynamics and Energetic - Second and Third Law of Thermodynamics
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.3

Which among the following reactions is an example of a zero order reaction?

a) `H_(2(g)) + I_(2(g)) -> 2HI_(g)`

b) `2H_2O_(2(l)) -> 2H_2O_(l) + O_(2(g))`

c) `C_12H_22O_(11(aq)) + H_2O_(l) -> C_6H_12O_(6(aq)) + C_6H_12O_(6(aq))`

d) `2NH_(3g)`   `N(2g) + 3H_(2(g))`

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [5] Chemical Kinetics
[1]1.4

Potential of saturated calomel electrode is-

(a) 0.242 V

(b) 1.1 V

(c) 0.337 V

(d) 0.28 v

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [4] Electrochemistry
[1]1.5

Which of the following compounds is used as a semipermeable membrane?

(a) Potassium ferrocyanide

(b) Potassium argentocyanide

(c) Sodium meta aluminate

(d) Copper ferrocyanide

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[1]1.6

Which among the following minerals does NOT contain aluminium?

(a) Cryolite

(b) Siderite

(c) China clay

(d) Corundum

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]1.7

The group 15 element having inner electronic configuration as of argon is-

(a) Phosphorous (z = 15)

(b) Antimony (z =51)

(c) Arsenic (z = 33)

(d) Nitrogen (z = 7)

 

Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[12]2 | Answer any 'SIX' of the following:
[2]2.1

Write chemical reactions involved in Van Arkel method for refining Titanium

Concept: Chemical Thermodynamics and Energetic - Equilibrium Constant
Chapter: [3] Chemical Thermodynamics and Energetic
[2]2.2

Explain the relationship between Gibb's standard energy change of the reaction and equilibrium constant.

Concept: Chemical Thermodynamics and Energetic - Equilibrium Constant
Chapter: [3] Chemical Thermodynamics and Energetic
[2]2.3

A face centred cube (FCC) consists of how many atoms? Explain

Concept: Number of Atoms in a Unit Cell
Chapter: [1] Solid State
[2]2.4

Describe isolation method in determination of rate law and order of reaction.

Concept: Rate of a Chemical Reaction
Chapter: [5] Chemical Kinetics
[2]2.5
[1]2.5.1

Explain the following methods to protect metals from corrosion:

Galvanization

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]2.5.2

Explain the following methods to protect metals from corrosion:

Passivation

 

Concept: Occurrence of Metals
Chapter: [6] General Principles and Processes of Isolation of Elements
[2]2.6

Write the Nemst equation and explain the terms involved.

Concept: Nernst Equation - Introduction
Chapter: [4] Electrochemistry
[2]2.7
[1]2.7.1

What happens when dilute sulphuric acid is treated with Fe

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[1]2.7.2

What happens when dilute sulphuric acid is treated with Fe

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[1]2.7.3

What happens when dilute sulphuric acid is treated with CaF2

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[1]2.7.4

What happens when dilute sulphuric acid is treated with CaF2

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[2]2.8

Define Osmosis

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

Define Freezing point.

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [2] Solutions and Colligative Properties
[6]3 | Answer any THREE of the fol1owing:
[2]3.1

The rate constant of a first order reaction are 0.58 S-1 at 313 K and 0.045 S-1 at 293 K. What is the energy of activation for the reaction?

Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [5] Chemical Kinetics
[2]3.2

Calculate the standard enthalpy of the reaction, 2C(graphite) + 3H2(g) → C2H6(g), ΔH° = ?

From the following ΔH° values

a) `C_2H_6(g) + 7/2 O_2(g) -> 2CO_2(g) + 3H_2 O(l)`.  ΔH° = -1560kJ

b) `H_2(g) + 1/2 O_2 (g) -> H_2O(l)`  ΔH° = -285.8kJ

c) C(graphite) + O2(g) -> CO2(g). ΔH° = -393.5kJ

Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation
Chapter: [3] Chemical Thermodynamics and Energetic
[2]3.3

3.795 g of sulphur is dissolved in 100g of CS2. This solution boils at 319.81 K. What is the molecular formula of sulphur in solution? The boiling point of CS2 is 319.45 K. (Given that Kb for CS2 = 2.42 K kg mol-1 and atomic mass of S = 32)

Concept: P - Block Group 16 Elements - Sulphur - Allotropic Forms
Chapter: [7.02] Group 16 Elements
[2]3.4

How is nitric acid prepared by Ostwald’s process?

Concept: P - Block Group 15 Elements - Nitric Acid
Chapter: [7.01] Group 15 Elements
[7]4 | Answer any ONE of the following:
[7]4.1

State Third law of thermodynamics

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

Write applications of standard molar entropy°.

Concept: Chemical Thermodynamics and Energetic - Dilution Introduction of Entropy as a State Function
Chapter: [3] Chemical Thermodynamics and Energetic

Draw neat labelled diagram of electrolytic refining of blister copper

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

Determine the density of Cesium chloride which crys tallizes in BCC type structure with the edge length 412.1 pm. The atomic masses of Cs and Cl are 133 and 35.5 respectively.

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

Predict the co-ordination No. of cs+ ion if `r_(Cs)^+` = 1.69Å and `r_(Cl)^-` = 1.81Å.

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[7]4.2

What happens when thin copper leaves are thrown in jar containing chlorine?

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

H2O is liquid while H2S is gas at room temperature. Explain.

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

The conductivity of 0.02M AgNO3 at 25°C is 2.428 x 10-3 Ω-1 cm-1. What is its molar
conductivity?

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

State Henry’s law.

Concept: Solubility - Solubility of a Gas in a Liquid
Chapter: [2] Solutions and Colligative Properties
[7]5 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]5.1

Sodium acetate reacts with Ethanoyl chloride to form

(a) Acetic acid

(b) Acetone

(c) Acetic anhydride

(d) Sodium formate

 

Concept: Rate of a Chemical Reaction
Chapter: [5] Chemical Kinetics
[1]5.2

Natalite is a mixture of

(a) diethyl ether and methanol

(b) diethyl ether and ethanol

(c) dimethyl ether and methanol

(d) dimethyl ether and ethanol

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[1]5.3

What is effective atomic number of Fe (z = 26) in [Fe(CN)6]4-?

(a) 12

(b) 30

(c) 26

(d) 36

 

Concept: Electronic Configurations of the D-block Elements
Chapter: [8.01] D-block Elements
[1]5.4

Maltose is a 

(a) Polysaccharide

(b) Disaccharide

(c) Trisaccharide

(d) Monosaccharide

Concept: Carbohydrates - Structures of Glucose
Chapter: [14.01] Carbohydrates
[1]5.5

Which one of the following oxidation state of Manganese is unstable?

(a) + 2

(b) + 4

(c) + 5

(d) + 7

Concept: Oxidation Reduction
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]5.6

IUPAC name of the following compound is

(a) 3 - Bromo- 3, 4- dimethylheptane

(b) 3, 4- dimethyl - 3- bromoheptane

(c) 5- Bromo- 4, 5- dimethylheptane

(d) 4, 5- dimethyl- 5- bromoheptane

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[1]5.7

Which of the following compounds is NOT prepared by the action of alcoholic NI3 on alkyl halide?

(a) CH3NH2

(b) CH3- CH2- NH2

(c) CH3 - CH2 - CH2 - NH2

(d) (CH3)C- NH2

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[12]6
[2]6.1

Write IUPAC names of the following compounds

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

Write IUPAC names of the following compounds:

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[2]6.2

What are the sources of Vitamin C and Vitamin K?

Concept: Vitamins - Classification of Vitamins
Chapter: [14.03] Vitamins
[2]6.3

Write four points of distinction between Lanthanoids and Actinoids.

Concept: F-block Elements - The Lanthanoids
Chapter: [8.02] F-block Elements
[2]6.4

How is Benzonitrile converted to Benzophenone?

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [9] Coordination Compounds
[2]6.5

Write the formulae of the raw materials used for preparation of Buna-S

Concept: Types of Polymerisation Reactions - Rubber
Chapter: [15] Polymers

Write the formulae of the raw materials used for preparation of Dextran.

Concept: Polymers - Some Important Polymers
Chapter: [15] Polymers
[2]6.6

Write a note on Sandmeyer's reaction.

Concept: Diazonium Salts - Importance of Diazonium Salts in Synthesis of Aromatic Compounds
Chapter: [13.03] Diazonium Salts
[2]6.7

What is the action of benzene diazonium chloride on phenol in alkaline medium

Concept: Diazonium Salts - Importance of Diazonium Salts in Synthesis of Aromatic Compounds
Chapter: [13.03] Diazonium Salts

What is the action of benzene diazonium chloride on Aniline

Concept: Diazonium Salts - Importance of Diazonium Salts in Synthesis of Aromatic Compounds
Chapter: [13.03] Diazonium Salts
[2]6.8

Explain any two chemical methods of food preservation.

Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Chapter: [16.02] Chemicals in Food
[9]7 | Answer any THREE of the following:
[3]7.1

What is the action of following reagents on glucose?

bromine water

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

What is the action of following reagents on glucose?

dilute HNO3

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

What is the action of following reagents on glucose?

hydroxyl amine

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates
[3]7.2

Explain  Ligand

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

Write four postulates of Werner's theory.

Concept: Werner’S Theory of Coordination Compounds
Chapter: [9] Coordination Compounds
[3]7.3

Write reactions involved in preparation of potassium dichromate from chrome iron ore

Concept: General Principles and Processes of Isolation of Elements - Principles and Methods of Extraction - Concentration
Chapter: [6] General Principles and Processes of Isolation of Elements
[3]7.4

What is metamerism? 

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

Write the structure and IUPAC name of 'methyl-n-propyl ether'.

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

What is the action of hot HI on it?

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[7]8 | Answer any ONE of the following
[7]8.1

How are the following polymers prepared?

Orion

Concept: Types of Polymerisation Reactions - Condensation Polymerisation Or Step Growth Polymerisation
Chapter: [15] Polymers

Write the reactions involved in the preparation of Teflon

 

Concept: Polymers - Preparation of Polytetrafluoroethene (Teflon)
Chapter: [15] Polymers

Classify the following drugs into Analgesics and Antibiotics 

(1) Ofloxacin

(2) Morphine

(3) Ampicillin

(4) Chloramphenicol

Concept: Chemicals in Medicines - Tranquilizers and Analgesics
Chapter: [16.01] Chemicals in Medicines

Identify 'A' and 'B' and rewrite the reactions

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

Identify 'A' and 'B' and rewrite the reactions

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

Identify 'A' and 'B' and rewrite the reactions

Concept: Bonding in Coordination Compounds - Introduction
Chapter: [9] Coordination Compounds
[7]8.2

How are the following conversions carried out?

2-methylbutan-1-ol into 2 -methylbutanoic acid.

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

Show how each of the following compounds can be converted to benzoic acid.

Phenylethene (Styrene)

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

How are the following conversions carried out?

Benzoic acid into metanitrobenzoic acid.

Concept: Bonding in Coordination Compounds - Crystal Field Theory (CFT)
Chapter: [9] Coordination Compounds

What is the action of Benzene Sulphonyl Chloride on primary, secondary and tertiary
amines?

Concept: Amines - Identification of Primary, Secondary and Tertiary Amines
Chapter: [13.01] Amines

Write two uses of formaldehyde

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

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