Chapter 9

Chemistry · 38 exercises

Problem 1

Give the allotropic forms of (i) carbon (ii) phosphorus (iii) sulphur

3 step solution

Problem 3

What is the action of heat on washing soda? Give equation.

2 step solution

Problem 4

What is lime? What is the principle involved in the preparation of lime?

7 step solution

Problem 5

What happens when bleaching powder is stored over a long period of time? Give equation.

3 step solution

Problem 6

What is meant by slaking of lime? Give equation.

2 step solution

Problem 8

What is clinker? Why is gypsum added to it?

3 step solution

Problem 10

A mixture of slaked lime, sand and water is known as

6 step solution

Problem 11

What is the chemical name of plaster of Paris? How is it prepared? Give equation.

3 step solution

Problem 12

What is the difference between glass and ceramic?

5 step solution

Problem 13

Why is glass called a supercooled liquid?

5 step solution

Problem 14

What happens when dried pots are subjected to firing?

5 step solution

Problem 15

What is meant by superphosphate of lime? Give its composition.

2 step solution

Problem 16

What is the need of adding fertilizers to soil at regular intervals?

4 step solution

Problem 17

The powdered mixture of raw materials taken for the manufacture of glass is called

2 step solution

Problem 18

What is the reason for the shiny glaze of some ceramic articles?

3 step solution

Problem 19

A type of glass darkens on exposure to sunlight. What is it? Why does it show that characteristic property?

5 step solution

Problem 20

Give the composition of pyrex glass. Give its uses.

3 step solution

Problem 23

Why is urea the most commonly used nitrogenous fertilizer?

5 step solution

Problem 24

Why are potassium fertilizers easily available?

4 step solution

Problem 25

How does glass gets its colour?

4 step solution

Problem 26

Give an example of a compound fertilizer and give its advantage over the single fertilizer.

3 step solution

Problem 29

What is green house effect?

5 step solution

Problem 31

What is the chemical name of bleaching powder? How is it prepared?

2 step solution

Problem 33

Why does \(\mathrm{SO}_{2}\) act as a bleaching agent?

5 step solution

Problem 34

Why is carbon monoxide called a harmful gas?

3 step solution

Problem 35

How is ammonia gas prepared in laboratory?

7 step solution

Problem 36

What is meant by annealing? What is its significance?

3 step solution

Problem 37

How is superphosphate of lime manufactured?

3 step solution

Problem 38

What is the composition of baking powder? How does it work?

5 step solution

Problem 39

Explain the difference in the manufacturing process of simple pottery and porcelain ware.

6 step solution

Problem 40

How is urea manufactured? What are the other nitrogenous fertilizers?

6 step solution

Problem 41

What is a soda-acid extinguisher? Explain the working process.

5 step solution

Problem 42

What is glass blowing? Which type of glass is suitable for that purpose? Why?

3 step solution

Problem 44

How is hydrochloric acid prepared in laboratory?

6 step solution

Problem 45

What is the principle involved in the use of bleaching powder for the sterilization of drinking water? Explain.

5 step solution

Problem 48

Explain the industrial preparation of nitrogen by Haber's process.

5 step solution

Problem 49

Give a detailed description of the manufacture of cement.

8 step solution

Problem 50

Explain the process of the manufacture of glass. What are its characteristics? Discuss the various types of glass along with their uses.

4 step solution

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