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Chemistry Set 1 2017-2018 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

Chemistry [Set 1]
Marks: 70Academic Year: 2017-2018
Date: July 2018
  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.

Section 1
[12]1 | Attempt any Six
[2]1.i

What is the role of the following compound -
CaF2 in metallurgy of aluminum?

Concept: Introduction to Solid State
Chapter: [0.01] Solid State

What is the role of the following compound- 
SiO2 in the extraction of copper from copper pyrites?

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[2]1.ii

Classify the following molecular solids into different types: 

  1. HCl
  2. CO2
  3. Solid ice
  4. SO2
Concept: Classification of Crystalline Solids
Chapter: [0.01] Solid State [0.01] Solid State
[2]1.iii

Define the following terms : 
a. Cryoscopic constant
b. Resistivity 

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [0.02] Solutions and Colligative Properties
[2]1.iv

Arrange the following oxyacids of chlorine in decreasing order of their thermal stability. Give reason.
 HOClO, HOCl, HClO4, HOClO2

Concept: P - Block Group 17 Elements - Oxoacids of Halogens
Chapter: [7.03] Group 17 Elements
[2]1.v

Derive van’t Hoff general solution equation 

Concept: Abnormal Molar Masses
Chapter: [0.02] Solutions and Colligative Properties
[2]1.vi

Represent a cell consisting of Mg2+ | Mg half cell and Ag+
 | Ag half cell and write the cell reaction.
( `"E"_("Ag")^° = 0.799 "V", "E"_("Mg")^° = - 2.37 "V"`)

Concept: Calculations Involving Unit Cell Dimensions
Chapter: [0.01] Solid State
[2]1.vii

Define the order of the chemical reaction.

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics

Find the overall order of the following reactions: 
1. CHCl3(g) + Cl2(g) → CCl4(g) + HCl(g), Rate = k[CHCl3][Cl2]
2. 2NO(g) + O2(g) → 2NO2(g),  Rate = k[NO]2[O2]

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[2]1.viii

State and explain Hess’s law of constant heat summation.

Concept: Chemical Thermodynamics and Energetic - Hess’ Law of Constant Heat Summation
Chapter: [0.03] Chemical Thermodynamics and Energetic
[9]2 | Attempt any THREE:
[3]2.i

Explain the following with the help of balanced chemical equation:
a. Bleaching action of SO2.
b. Dehydration of formic acid by concentrated H2SO4.
c. Burning of benzene in presence of excess of dioxygen.

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[3]2.ii

The density of silver having an atomic mass of 107.8 g mol- 1 is 10.8 g cm-3. If the edge length of cubic unit cell is 4.05 × 10- 8
 cm, find the number of silver atoms in the unit cell.
 ( NA = 6.022 × 1023, 1 Å = 10-8 cm)

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[3]2.iii

How much quantity of electricity in coulomb is required to deposit 1.346 × 10-3 kg of Ag in 3.5 minutes from AgNO3 solution?
( Given: Molar mass of Ag is 108 × 10-3 kg mol-1 )

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [0.04] Electrochemistry
[3]2.iv

5 moles of helium expand isothermally and reversibly from a pressure 40 × 10-5  N m-2 to 4 × 10-5 N m-2  at 300 K. Calculate the work done, change in internal energy and heat absorbed during the expansion. (R = 8.314 J K-1  mol-1).

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
Chapter: [0.03] Chemical Thermodynamics and Energetic
[7]3 | Answer the following:
[2]3.i

Write structure and molecular formula for the following compounds:
a. Orthophosphoric acid 
b. Sulphurous acid

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[2]3.ii

What is the ‘Ellingham diagram’? Write any ‘two points’ of its significance. 

Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Chapter: [0.04] Electrochemistry
[3]3.iii

In a first-order reaction A → product, 80% of the given sample of compound decomposes in 40 min. What is the half-life period of the reaction? 

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [0.05] Chemical Kinetics
OR
[2]3.iv | Answer the following:

Write features of a reversible process.

Concept: Chemical Thermodynamics and Energetic - Chemical Thermodynamics and Energetic
Chapter: [0.03] Chemical Thermodynamics and Energetic
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[2]3.v

Write any ‘four points’ of difference between fluorine and other halogens.

Concept: P - Block Group 17 Elements - Anomalous Behaviour of Fluorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
[3]3.vi

What is the freezing point of a liquid? The freezing point of pure benzene is 278.4 K. Calculate the freezing point of the solution when 2.0 g of a solute having molecular weight 100 g mol-1
 is added to 100 g of benzene.
( Kf of benzene = 5.12 K kg mol-1 .) 

Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point
Chapter: [0.02] Solutions and Colligative Properties
[7]4 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]4.i

A substance which shows the highest entropy is ___________.

SrCO3(s)

Cu(s)

NaCl(aq.)

Cl2(g)

Concept: Chemical Thermodynamics and Energetic - Dilution Introduction of Entropy as a State Function
Chapter: [0.03] Chemical Thermodynamics and Energetic
[1]4.ii

The process of extracting a soluble material from an insoluble solid by dissolving out in a suitable solvent is known as _________. 

calcination

roasting 

leaching 

smelting 

Concept: Chemistry in Everyday Life
Chapter: [0.16] Chemistry in Everyday Life
[1]4.iii

The kinetic order for the following reaction is ________. 
\[\ce{2N_2O_(g) ->[Pt] 2N_2_(g) + O_2_(g) }\]

zero 

first

second

third

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[1]4.iv

Which of the following compounds of chlorine is used as refrigerant? 

CCl3NO2

CCl2F2

COCl2

CCl4

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
[1]4.v

4.0 grams of NaOH ( Molar mass = 40.0 g mol-1 ) is dissolved in 500 cm3 of water. What is the molarity of NaOH solution? 

1 M

0.8 M

0.5 M

0.2 M

Concept: Colligative Properties and Determination of Molar Mass - Introduction
Chapter: [0.02] Solutions and Colligative Properties
[1]4.vi

Number of types of orthorhombic unit cell is ___________.

7

3

4

2

Concept: Number of Atoms in a Unit Cell
Chapter: [0.01] Solid State
[1]4.vii

The S.I. unit of cell constant for conductivity cell is __________.

m-1

S m-2

cm-2

S dm2 mol-1

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [0.04] Electrochemistry
SECTION II
[12]5 | Attempt any SIX:
[2]5.i

Explain the geometry of [Cu(NH3)4]2+ on the basis of hybridisation [ At. No. Cu = 29 ]. 

Concept: Concept of Group 15 Elements
Chapter: [7.01] Group 15 Elements
[2]5.ii

What are 'd' and 'f' block elements?

Concept: D-block Elements - General Indroduction
Chapter: [8.01] D-block Elements
[2]5.iii

Write a short note on Sandmeyer’s reaction. 

Concept: Methods of Preparation of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes
[2]5.iv

What is the action of the following on isopropyl methyl ether? 
a. Cold HI
b. Hot HI

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[2]5.v

Write balanced equation for the following conversion: 
a. Cyclopropane carboxylic acid to cyclopropylmethanol.
b. Acetyl chloride to benzyl methyl ketone using dialkyl cadmium. 

Concept: Chemical Properties and Reactions of Carboxylic Acid
Chapter: [12.02] Carboxylic Acids
[2]5.vi

What is the action of lithium aluminum hydride in the presence of ether on the following compounds? 
a. Nitroethane 
b. 2-Methyl-1-nitropropane

Concept: Coordination Compounds - Importance of Coordination Compounds
Chapter: [0.09] Coordination Compounds [0.09] Coordination Compounds
[2]5.vii

How is glucose prepared from starch? 

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates
[2]5.viii

Define:
a. Analgesics 
b. Antimicrobials 

Concept: Chemistry in Everyday Life
Chapter: [0.16] Chemistry in Everyday Life
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[9]6 | Attempt any THREE
[3]6.i

Complete and rewrite the balanced chemical equation for the following reactions: 
a. \[\ce{1-chloro-2, 4-dinitrobenzene ->[aq. alkali][368 K, H+]}\] ?

b. \[\ce{Benzaldehyde ->[50‰ KOH] }\] ?

c. \[\ce{Acetone + phenylhydrazine ->[H+]}\] ?

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[3]6.ii

Write a preparation of phenol from cumene? What happens when phenol is heated with zinc dust? 

Concept: Phenols - Methods of Preparation
Chapter: [11.02] Phenols
[3]6.iii

What are racemates?

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Elimination Reactions
Chapter: [0.1] Halogen Derivatives [10.01] Haloalkanes

What is the action of following reagents on glucose?
1. Bromine water
2. Hydroxylamine

Concept: Carboxylic Acids - Methods of Preparation of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
[3]6.iv

What are elastomers? 

Concept: Polymers - Classification of Polymers Based on Source
Chapter: [0.15] Polymers

Distinguish between thermoplastic polymers and thermosetting polymers.

Concept: Polymers - Classification of Polymers Based on Source
Chapter: [0.15] Polymers
[7]7 | Answer the following:
[2]7.i

What is the action of the following on lanthanoids?
a. water
b. Sulphur, heat
c. nitrogen, heat

Concept: F-block Elements - The Lanthanoids
Chapter: [8.02] F-block Elements
[2]7.ii

Draw the structures of veronal and thymine. 

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
[2]7.iii

Identify A and B from the following reaction and rewrite complete reaction: 

Concept: Chemical Properties and Reactions of Carboxylic Acid
Chapter: [12.02] Carboxylic Acids
OR
[3]7.iv

Write the preparation of benzoic acid from the following: 
a. styrene
b. benzamide
c. dry ice

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[3]7.v

Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol? 

Concept: Some Commercially Important Alcohols
Chapter: [11.01] Alcohols
[1]7.vi

Write the formula for pentaamminechlorocobalt (III) sulphate. 

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[7]8 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]8.i

A polymer which contains ester linkage is_______.

teflon

buna-N 

dextron

neoprene 

Concept: Introduction of Polymers
Chapter: [0.15] Polymers
[1]8.ii

An antihistamine drug is _______.

salvarsan

chloramphenicol

seldane 

prontosil 

Concept: Chemistry in Everyday Life
Chapter: [0.16] Chemistry in Everyday Life
[1]8.iii

Identify A and B respectively in the following reaction:
\[\ce{tert-butyl alcohol ->[20‰H2SO4][363K] A + H2O ->[HBr][H2O2] B}\]

2 - Methylpropene, 1- bromo - 2 - methylpropane

2 - Methylpropene, 2 - bromo - 2 - methylpropane

2 - Methylpropane, 1 - bromo - 2 - methylpropane

2 - Methylpropane, 2 - bromo - 2 - methylpropane 

Concept: Alcohols - Methods of Preparation
Chapter: [11.01] Alcohols
[1]8.iv

The ligand triethylenetetramine is _______.

monodentate 

bidentate

tridentate 

tetradentate 

Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds
Chapter: [0.09] Coordination Compounds
[1]8.v

Pyrolusite ore is _______.

MnO

MnO

Mn2O7

Mn2O3

Concept: Magnetic Properties
Chapter: [0.01] Solid State
[1]8.vi

\[\ce{C2H5 - Br + Nal ->[dry acetone] C2H5 - I + NaBr}\]
The above reaction is _______.

Wurtz reaction

Balz-Schiemann reaction

Swarts reaction 

Finkelstein reaction

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
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[1]8.vii

The functional group present in triacylglycerol is _______.

alcohol

ether

ester

amine

Concept: Carboxylic Acids - Methods of Preparation of Carboxylic Acids
Chapter: [12.02] Carboxylic Acids
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Maharashtra State Board previous year question papers 12th Board Exam Chemistry with solutions 2017 - 2018

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