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Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

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Chemistry
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Hydrolysis of sucrose is called ______.

Appears in 2 question papers
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Disaccharides

What is the role of sulphur in the vulcanisation of rubber?

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Rubber

Write the names and structures of the monomers of the following polymers: Buna-N

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Classification of Polymers> Based on Mode of Polymerisation

Write the names and structures of the monomers of the following polymers: Polyvinyl chloride

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Classification of Polymers> Based on Structure

Write names and chemical formulae of monomers used in preparing Buna-N.

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Rubber

Write the structures of monomers used the following polymers: 
Nylon - 6, 6

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Condensation Polymerisation Or Step Growth Polymerisation

Is   a homopolymer or copolymer? Give reason. 

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Copolymerisation

Write the monomers of the following polymer : 

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Some Important Polymers

What is meant by the term ‘broad spectrum antibiotics’? Explain.

Appears in 2 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Compounds with Medicinal Properties >> Antimicrobials

Explain any two chemical methods of food preservation.

Appears in 2 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives

Iron (z=26) is highly ferromagnetic. Explain.

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Properties of Solids: Magnetic Properties

Silver crystallises in FCC structure. If density of silver is 10.51 gcm-3, calculate the volume of unit cell. [Atomic mass of slive (Ag) = 108 gm-1]

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Calculations Involving Unit Cell Dimensions

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Classification of Crystalline Solids

What is the covalency of nitrogen in N2O5?

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Classification of Crystalline Solids

8 g of glucose, C6H12O6 (Molar Mass = 180 g mol−1) is dissolved in 1 kg of water in a sauce pan. At what temperature will this solution boil? 

(Kb for water = 0.52 K kg mol−1, boiling point of pure water = 373.15 K)

Appears in 1 question paper
Chapter: [1] Solutions
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point

What type of semiconductor is obtained when silicon is doped with boron? 

 

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors

What type of magnetism is shown in the following alignment of magnetic moments?

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Properties of Solids: Magnetic Properties

What type of point defect is produced when AgCl is doped with CdCl2?

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

Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.

(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)

Appears in 1 question paper
Chapter: [1] Solutions
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure

Give an example each of a molecular solid and an ionic solid.

Appears in 1 question paper
Chapter: [1] Solid State
Concept: Classification of Crystalline Solids
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