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Chemistry Set 1 2018-2019 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

Chemistry [Set 1]
Marks: 70Academic Year: 2018-2019
Date & Time: 27th February 2019, 11:00 am
Duration: 3h

SECTION - A
[1]1

A compound used as pistachio flavour in ice cream is ___________

vanillin

acetophenone

muscone

butyraldehyde

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
[1]2

Oxidation states of scandium are ___________.

+1, +2

+1, +3

+2, + 3

+3, +4

Concept: D-block Elements - General Indroduction
Chapter: [8.01] D-block Elements
[1]3

In Van Arkel method for refining zirconium or titanium, the halogen used is __________.

fluorine

chlorine

bromine

iodine

Concept: General Principles and Processes of Isolation of Elements - Principles and Methods of Extraction - Concentration
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[1]4

A system absorbs 6 kJ of heat and does 1.5 kJ of work on its surroundings. The change in internal energy is __________.

– 7.5 kJ

– 4.5 kJ

+4.5 kJ

+ 7.5 kJ

Concept: Chemical Thermodynamics and Energetic - Internal Energy and Enthalpy
Chapter: [0.03] Chemical Thermodynamics and Energetic
[1]5

Write the molecular formula of noverstrol.

Concept: Drugs and Their Classification
Chapter: [16.01] Chemicals in Medicines
[1]6

Write the number of hydroxyl groups present in α - D (+) -Glucopyranose (trans.)

Concept: Introduction of Carbohydrates
Chapter: [14.01] Carbohydrates
[1]7

What is Nessler’s reagent ?

Concept: P - Block Group 15 Elements - Ammonia
Chapter: [7.01] Group 15 Elements
[1]8

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

Concept: Electrical Properties - Applications of N-type and P-type Semiconductors
Chapter: [0.01] Solid State
SECTION - B
[2]9

What are ethers?

Concept: Ethers - Ethers
Chapter: [11.03] Ethers

How are ethers classified?

Concept: Ethers - Ethers
Chapter: [11.03] Ethers
[2]10

What are antacids? 

Concept: Chemicals in Medicines - Antacids
Chapter: [16.01] Chemicals in Medicines

Write the main constituents of dettol.

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols
[2]11

Draw a neat, well labelled diagram of electrolytic cell for extraction of aluminium

Concept: Occurrence of Metals
Chapter: [0.06] General Principles and Processes of Isolation of Elements
[2]12
[2]12.A

How many faradays of electricity are required to produce 6 g of Mg from MgCl2?

Concept: Electrochemical Cells
Chapter: [0.04] Electrochemistry [0.05] Electrochemistry
OR
[2]12.B

The molar conductivity of 0.05 M BaCl2 solution at 25° C is 223Ω-1 cm2 mol-1. What is its conductivity?

Concept: Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration
Chapter: [0.04] Electrochemistry
[2]13

Derive van’t Hoff general solution equation.

Concept: Types of Solutions
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
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[2]14

Write the conditions for maximum work done by the system.

Concept: Chemical Thermodynamics and Energetic - Chemical Thermodynamics and Energetic
Chapter: [0.03] Chemical Thermodynamics and Energetic
[2]15

Write balanced chemical equation for the following :
Action of sodium metal on ethanol.

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

Write balanced chemical equation for the following :
Action of zinc dust on phenol.

Concept: Phenols - Uses of Phenols
Chapter: [11.02] Phenols
SECTION - C
[3]16

Write chemical reaction to prepare the following polymer: Teflon

Concept: Polymers - Preparation of Polytetrafluoroethene (Teflon)
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry

Write chemical reaction to prepare the following polymer :
Nylon - 6

Concept: Polymers - Nylon 6
Chapter: [0.15] Polymers

Write chemical reaction to prepare the Dextron polymer:
Dextron

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [0.15] Polymers
[3]17

How is glucose prepared by commercial method? How is peptide linkage formed?

Concept: Carbohydrates - Preparation of Glucose from Sucrose (Cane Sugar) and Starch
Chapter: [14.01] Carbohydrates
[3]18

Write a short note on Hoffmann elimination

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
Chapter: [7.01] Group 15 Elements
[3]19

What is the action of the following on ethyl bromide
alcoholic solution of potassium hydroxide.

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

What is the action of the following on ethyl bromide:
moist silver oxide

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

What is the action of the following on ethyl bromide:
silver acetate

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10.01] Haloalkanes
[3]20

What is effective atomic number? Calculate effective atomic number of copper  ( Z = 29 ) in (Cu ( NH3)4)2+

Concept: Coordination Compounds - Introduction
Chapter: [0.09] Coordination Compounds
[3]21

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphorous pentachloride

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[3]22

Write Arrhenius equation. Derive an expression for temperature variations

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[3]23

Define electrochemical series. Write its applications

Concept: Electrochemical Cells
Chapter: [0.04] Electrochemistry [0.05] Electrochemistry
[3]24
[3]24.A

Calculate the work done in the following reaction at 50°C. State whether work is done on the system or by the system.
`"SO"_2("g") + 1/2"O"_(2("g")) rightarrow "SO"_(3("g"))`

Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation
Chapter: [0.03] Chemical Thermodynamics and Energetic
OR
[3]24.B

The standard enthalpy of combustion of formaldehyde Δ0H0 = -571 kJ. How much heat will be evolved in the formation of 22 g of CO2?

Concept: Chemical Thermodynamics and Energetic - Combustion, Formation, Atomization, Sublimation
Chapter: [0.03] Chemical Thermodynamics and Energetic
[3]25

Define the following term:
isotonic solution

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions

Define the following term:
hypertonic solution

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions

Define the following term:
hypotonic solution

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
[3]26

Distinguish between crystalline solids and amorsphous solids.

Concept: Classification of Crystalline Solids
Chapter: [0.01] Solid State [0.01] Solid State

Define Anisotropy.

Concept: Classification of Crystalline Solids
Chapter: [0.01] Solid State [0.01] Solid State
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SECTION - D
[5]27 | Attempt any one
[1]27.A

Write the structure of Phenylmethanamine.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[4]27.B

Write chemical equation for the following :
Gatterman - Koch formylation

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones

Write chemical equation for the following:

Rosenmund reduction

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones

Write chemical equation for the following :
Fischer esterificatione

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of C-OH Bond
Chapter: [12.02] Carboxylic Acids

Write chemical equation for the following :
Hell - Vohlard - Zelinsky reaction

Concept: Carboxylic Acids - Chemical Reactions of Carboxylic Acids - Substitution Reactions in the Hydrocarbon Part
Chapter: [12.02] Carboxylic Acids
OR
[1]27.C

What are amines?

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[4]27.D

How will you convert calcium acetate to acetaldehyde?

Concept: Aldehydes and Ketones - Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones

How will you convert acetone to acetone cyanohydrin?

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

How will you convert sodium acetate to methane?

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

How will you convert benzoic acid to m-bromobenzoic acid?

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[5]28 | Attempt any one.
[1]28.A

Define Enantiomers.

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[4]28.B

How is potassium dichromate prepared from chrome iron ore?

Concept: General Properties of the Transition Elements (D-block)
Chapter: [8.01] D-block Elements
OR
[1]28.C

What is Grignard reagent?

Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloarenes - Nucleophilic Substitution
Chapter: [10.02] Haloarenes
[4]28.D

Explain the position of actinoids in the periodic table.
What is the action of sulphur on lanthanoids? Calculate the magnetic moment of divalent ion in aqueous solution it its atomic number is 24.

Concept: D-block Elements - General Indroduction
Chapter: [8.01] D-block Elements
[5]29 | Attempt any one
[1]29.A

The rate of a first order reaction, A →B is 5.4 ×10-6 
Ms-1when [A] is 0.3M. Calculate the rate constant of the reaction.

Concept: Rate of a Chemical Reaction
Chapter: [0.05] Chemical Kinetics
[4]29.B

Explain the following properties of group 16 elements :
1) Electro negativity
2) Melting and boiling points
3) Metallic character
4) Allotropy

Concept: Concept of Group 16 Elements
Chapter: [7.02] Group 16 Elements
OR
[1]29.C

The half life period of a first order reaction is 6. 0 h . Calculate the rate constant

Concept: Integrated Rate Equations - Half-life of a Reaction
Chapter: [0.05] Chemical Kinetics
[4]29.D

What are oxides?  Write different types of oxides with one example each.

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