HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Chemistry 2015 - 2016 HSC Science (Electronics) 12th Board Exam


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

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

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

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

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

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

Which among the following minerals does NOT contain aluminium?

(a) Cryolite

(b) Siderite

(c) China clay

(d) Corundum

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

 

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

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

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

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

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

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

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

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

Explain the following methods to protect metals from corrosion:

Galvanization

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

Explain the following methods to protect metals from corrosion:

Passivation

 

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

Write the Nemst equation and explain the terms involved.

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

What happens when dilute sulphuric acid is treated with Fe

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

What happens when dilute sulphuric acid is treated with Fe

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

What happens when dilute sulphuric acid is treated with CaF2

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

What happens when dilute sulphuric acid is treated with CaF2

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

Define Osmosis

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

Define Freezing point.

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

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

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

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

How is nitric acid prepared by Ostwald’s process?

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

State Third law of thermodynamics

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

Write applications of standard molar entropy°.

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

Draw neat labelled diagram of electrolytic refining of blister copper

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

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.

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

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

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

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

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

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

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

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

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

State Henry’s law.

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

 

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

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

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

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

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

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

 

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

Maltose is a 

(a) Polysaccharide

(b) Disaccharide

(c) Trisaccharide

(d) Monosaccharide

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

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

(a) + 2

(b) + 4

(c) + 5

(d) + 7

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

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

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

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

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

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

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

Write IUPAC names of the following compounds

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

Write IUPAC names of the following compounds:

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

What are the sources of Vitamin C and Vitamin K?

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

Write four points of distinction between Lanthanoids and Actinoids.

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

How is Benzonitrile converted to Benzophenone?

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

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

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

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

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

Write a note on Sandmeyer's reaction.

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

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

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

What is the action of benzene diazonium chloride on Aniline

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

Explain any two chemical methods of food preservation.

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

What is the action of following reagents on glucose?

bromine water

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

What is the action of following reagents on glucose?

dilute HNO3

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

What is the action of following reagents on glucose?

hydroxyl amine

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

Explain  Ligand

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

Write four postulates of Werner's theory.

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

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

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

What is metamerism? 

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

What is metamerism? 

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

What is metamerism? 

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

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

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

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

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

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

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

What is the action of hot HI on it?

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

What is the action of hot HI on it?

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

What is the action of hot HI on it?

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

How are the following polymers prepared?

Orion

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

Write the reactions involved in the preparation of Teflon

 

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

Classify the following drugs into Analgesics and Antibiotics 

(1) Ofloxacin

(2) Morphine

(3) Ampicillin

(4) Chloramphenicol

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

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

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

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

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

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

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

How are the following conversions carried out?

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

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

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

Phenylethene (Styrene)

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

How are the following conversions carried out?

Benzoic acid into metanitrobenzoic acid.

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

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

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

Write two uses of formaldehyde

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