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

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Chemistry
Set 1
2018-2019 February
Marks: 70

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: [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: [6] 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: [3] 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: [1] Solid State
SECTION -B
[2]9

What are ethers? How are they classified?

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

What are antacids? Write the main constituents of dettol.

Concept: Chemicals in Medicines - Antacids
Chapter: [16.01] Chemicals in Medicines
[2]11

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

Concept: Electrolytic Cells and Electrolysis - Introduction
Chapter: [4] Electrochemistry
[2]12

How many faradays of electricity are required to produce 6 g of Mg from MgCl2?
(OR)
The molar conductivity of 0.05 M BaCl2 solution at 25° C is 223`Omega` cm2 mol-1 . What is conductivity?

Concept: Electrochemical Cells
Chapter: [4] Electrochemistry
[2]13

Derive van’t Hoff general solution equation

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

Write the conditions for maximum work done by the system.

Concept: Chemical Thermodynamics and Energetic - Chemical Thermodynamics and Energetic
Chapter: [3] Chemical Thermodynamics and Energetic
[2]15

Write balanced chemical equations for the following :
1) Action of sodium metal on ethanol.
2) Action of zinc dust on phenol

Concept: Classification of Alcohols and Phenols
Chapter: [11.01] Alcohols
SECTION - C
[3]16

Write chemical reactions to prepare the following polymers :
1) Teflon
2) Nylon - 6
3) Dextron

Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation
Chapter: [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
1) alcoholic solution of potassium hydroxide.
2) moist silver oxide
3) silver acetate?

Concept: Introduction of Haloalkanes and Haloarenes
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
[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: [9] 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: [5] Chemical Kinetics
[3]23

Define electrochemical series. Write its applications

Concept: Electrochemical Cells
Chapter: [4] Electrochemistry
[3]24

Calculate the work done in the following reaction at 50o 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: [3] Chemical Thermodynamics and Energetic
[3]25

Define the following terms :
1) isotonic solution
2) hypertonic solution
3) hypotonic solution

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [2] Solutions and Colligative Properties
[3]26

Define Anisotropy. Distinguish between crystalline solids and amorsphous solids.

Concept: Classification of Crystalline Solids
Chapter: [1] Solid State
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 :
1) Gatterman - Koch formylation
2) Rosenmund reduction
3) Fischer esterification
4) Hell - Vohlard - Zelinsky reaction

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
(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
1) calcium acetate to acetaldehyde
2) acetone to acetone cyanohydrin
3) sodium acetate to methane
4) 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 ×10-5 Ms-1when [A] is 0.3M. Calculate the rate constant of the reaction.

Concept: Rate of a Chemical Reaction
Chapter: [5] 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: [5] Chemical Kinetics
[4]29.D

What are oxides? [4] 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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