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Chemistry 2016-2017 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Chemistry
2016-2017 March
Marks: 70

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

An antifriction alloy made up of antimony with tin and copper, which is extensively used in machine bearings is called _______.

(A) Duralumin

(B) Babbitt metal

(C) Spiegeleisen

(D) Amalgam

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
[1]1.2

Which of the following pairs is an intensive property?

(A) Density, viscosity

(B) Surface tension, mass

(C) Viscosity, internal energy

(D) Heat capacity, volume

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [3] Chemical Thermodynamics and Energetic
[1]1.3

Fe2+ ions react with nitric oxide formed from reduction of nitrate and yields a brown  coloured complex _______.

(A) [Fe(CO)5NO]2+

(B) [Fe(NH3)5NO]2+

(C) [Fe(CH3NH2)5NO]2+

(D) [Fe(H2O)5NO]2+

Concept: P - Block Group 16 Elements - Simple Oxides
Chapter: [7.02] Group 16 Elements
[1]1.4

MnO2 and Ca3(PO4)2 present in iron ore get reduced to Mn and P in the zone of _______.

(A) combustion

(B) reduction

(C) fusion

(D) slag formation

Concept: Oxidation Reduction
Chapter: [6] General Principles and Processes of Isolation of Elements
[1]1.5

An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face
and ‘B’ ions occupying corners of the cube. The formula of compound is _______.

(A) AB4

(B) A3B

(C) AB

(D) AB3

Concept: Classification of Crystalline Solids
Chapter: [1] Solid State
[1]1.6

On passing 1.5 F charge, the number of moles of aluminium deposited at cathode are _______ [Molar mass of Al = 27 gram mol–1]

(A) 1.0

(B) 13.5

(C) 0.50

(D) 0.75

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
[1]1.7

For a chemical reaction, A→ products, the rate of reaction doubles when the concentration of
‘A’ is increased by a factor of 4, the order of reaction is

(A) 2

(B) 0.5

(C) 4

(D) 1

Concept: Chemical Thermodynamics and Energetic - State Functions
Chapter: [3] Chemical Thermodynamics and Energetic
[12]2 | Answer any SIX of the following:
[2]2.1

What are fuel cells?

Concept: Electrochemical Cells
Chapter: [4] Electrochemistry

Write cathode and anode reaction in a fuel cell.

Concept: Electrochemical Cells
Chapter: [4] Electrochemistry
[2]2.2

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]2.3

Explain magnetic separation process of ores with the help of a neat, labelled diagram.

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
[2]2.4

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: [2] Solutions and Colligative Properties
[2]2.5

Define the term ‘enthalpy’.

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

What will happen to the internal energy if work is done by the system?

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [3] Chemical Thermodynamics and Energetic
[2]2.6

Account for the following : Nitrogen does not form pentahalide.

Concept: P - Block Group 15 Elements - Dinitrogen
Chapter: [7.01] Group 15 Elements
[2]2.7

Calculate the percentage efficiency of packing in case of simple cubic cell.

Concept: Number of Atoms in a Unit Cell
Chapter: [1] Solid State
[2]2.8

Write the electronic configuration of the following elements:

Sulphur (Z = 16)

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

Write the electronic configuration of the following element:

Krypton (Z = 36)

Concept: P - Block Group 18 Elements - Concept of Group 18 Elements
Chapter: [7.04] Group 18 Elements
[9]3 | Answer any THREE of the following:
[3]3.1

How is phosphine prepared using the following reagent?
HCl

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

How is phosphine prepared using the following reagent?

H2SO4

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

How is phosphine prepared using the following reagent?

Caustic soda

Concept: P - Block Group 15 Elements - Phosphine
Chapter: [7.01] Group 15 Elements
[3]3.2

0.05 M NaOH solution offered a resistance of 31.6 Ω in a conductivity cell at 298 K. If the cell constant of the cell is 0.367 cm-1, calculate the molar conductivity of NaOH solution.

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [4] Electrochemistry
[3]3.3

Calculate ΔH° for the reaction between ethene and water to form ethyl alcohol from the
following data:

ΔcH° C2H5OH(l) = -1368 kJ
ΔcH° C2H4(g) = -1410 kJ
Does the calculated ΔH° represent the enthalpy of formation of liquid ethanol?

Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation
Chapter: [3] Chemical Thermodynamics and Energetic
[3]3.4

In the Arrhenius equation for a first order reaction, the values of ‘A’ of ‘Ea’ are 4 x 1013 sec-1 and 98.6 kJ mol-1 respectively. At what temperature will its half life period be 10 minutes? 
[R = 8.314 J K-1 mol-1]

Concept: Temperature Dependence of the Rate of a Reaction
Chapter: [5] Chemical Kinetics
[7]4 | Answer any ONE of the following:
[7]4.1

State the first law of electrolysis

 

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

Write any two uses of H2SO4

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

Write any two uses of Chlorine

 

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

Distinguish between crystalline solid and amorphous solid

Concept: Amorphous and Crystalline Solids
Chapter: [1] Solid State

A solution of a substance having mass 1.8 x 10-3 kg has the osmotic pressure of 0.52 atm at 280 K. Calculate the molar mass of the substance used.
[Volume = 1 dm3, R = 8.314 J K-1 mol-1]

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [2] Solutions and Colligative Properties
[7]4.2

Define Leaching.

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

Define Metallurgy

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

Define anisotropy.

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

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

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

The boiling point of benzene is 353.23 K. When 1.80 gram of non-volatile solute  was dissolved in 90 gram of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of solute.
[Kb for benzene = 2.53 K kg mol-1]

Concept: Colligative Properties and Determination of Molar Mass - Introduction
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

When primary amine reacts with CHCl3 in alcoholic KOH, the product is _______.

(A) aldehyde

(B) alcohol

(C) cyanide

(D) an isocyanide

Concept: Amines - Identification of Primary, Secondary and Tertiary Amines
Chapter: [13.01] Amines
[1]5.2

`CH_3-CH_2-Br"Alcoholic KOH"/""> B " HBR"/"">C"Na/Eather"/"">D`, the Compound D is

(A) ethane

(B) propane

(C) n-butane

(D) n-pentane

Concept: Physical and Chemical Properties of Alcohols and Phenols
Chapter: [11.01] Alcohols
[1]5.3

Cisplatin compound is used in the treatment of _______.

(A) malaria

(B) cancer

(C) AIDS

(D) yellow fever

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[1]5.4

A gas when passed through K2Cr2O7 and dil. H2SO4 solution turns it green, the gas is

(A) CO2

(B) NH3

(C) SO2

(D) Cl2

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[1]5.5

The alcohol used in thermometers is _______.
(A) methanol

(B) ethanol

(C) propanol

(D) butanol

 

Concept: Classification of Alcohols and Phenols
Chapter: [11.01] Alcohols
[1]5.6

Which of the following vitamins is the vitamin of alicyclic series?

(A) Vitamin C

(B) Vitamin K

(C) Vitamin B

(D) Vitamin A

Concept: Vitamins - Important Vitamins, Their Sources and Their Deficiency Diseases
Chapter: [14.03] Vitamins
[1]5.7

Which of the following is the first oxidation product of secondary alcohol?

(A) Alkene

(B) Aldehyde

(C) Ketone

(D) Carboxylic acid

Concept: Alcohols - Secondary and Tertiary Alcohols
Chapter: [11.01] Alcohols
[12]6
[2]6.1

How is diethyl ether prepared by continuous etherification process?

Concept: Ethers - Ethers
Chapter: [11.03] Ethers
[2]6.2

Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction

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

How is ethanoic acid prepared from dry ice?

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[2]6.4

Write the molecular and structural formula of BHA and BHT.

Concept: Phenols - Phenols
Chapter: [11.02] Phenols
[2]6.5

Describe laboratory method for preparation of glucose.

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates
[2]6.6

Write the factors which are related to the colour of transition metal ions.

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

Explain the given terms: Homopolymers

Concept: Polymers - Classification of Polymers Based on Source
Chapter: [15] Polymers

Explain the given terms : Elastomers

Concept: Polymers - Classification of Polymers Based on Source
Chapter: [15] Polymers
[2]6.8

Define racemic mixture.

Concept: Physical Properties of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes

Give IUPAC name of :

Concept: Aldehydes and Ketones - Nomenclature
Chapter: [12.01] Aldehydes and Ketones
[9]7 | Answer any THREE of the following:
[3]7.1

What is ‘effective atomic number’ (EAN)?

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [9] Coordination Compounds [9] Coordination Compounds

Calculate the effective atomic number of the central metal atom in the following  compounds:

K4Fe(CN)Fe(Z=26)

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [9] Coordination Compounds [9] Coordination Compounds

Calculate the effective atomic number of the central metal atom in the following  compounds:

Cr(CO)6 Cr(Z=24)

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [9] Coordination Compounds [9] Coordination Compounds
[3]7.2

Write the different oxidation states of iron

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

Write a note on ‘aldol condensation’.

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [12.01] Aldehydes and Ketones
[3]7.4

What are nucleic acids? Mention their two important functions.

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

Define complex lipids

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

Mention 'two' functions of lipids

Concept: Proteins - Structure, Classification and Functions
Chapter: [14.02] Proteins
[7]8 | Answer any ONE of the following:
[7]8.1

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on ethyl amine

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on aniline

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on diethyl amine

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines

How is Nylon 6, 6 prepared?

Concept: Polymers - Nylon 66
Chapter: [15] Polymers

What are ‘antacids’?

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

Write any ‘two’ side effects of tranquilizers.

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[7]8.2

Explain the mechanism of alkaline hydrolysis of tert-butyl bromide with energy profile
diagram.

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

Define carbolic acid.

Concept: Phenols - Phenols
Chapter: [11.02] Phenols

How carbolic acid is prepared from benzene sulphonic acid?

Concept: Phenols - Phenols
Chapter: [11.02] Phenols

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