Punjab 10th Class Chemistry Chapter 8 Chemical Industries Test Preparation Online

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Question 1 of 10

Chemistry

1. A mixture of Cu₂S and FeS called matte is produced in one of the metallurgical operations in the extraction of copper. The name of this operation is:

1.Roasting

2.Smelting

3.Electro-refining

4.Bessemerization

Question 1 of 10

Question 2 of 10

2. In electrolytic refining of copper, __________ is used as anode.

1.Impure copper

2.Pure copper

3.Copper sulphate

4.Electrolytic tank

Question 2 of 10

Question 3 of 10

3. Calcination is the process in which sodium hydrogen carbonate is heated to get sodium carbonate. Which is not obtained in this process?

1.H₂O

2.Na₂CO₃

3.CO

4.CO₂

Question 3 of 10

Question 4 of 10

4. Which of the following steps is not used in the extraction process of metals:

1.Roasting

2.Flotation

3.Smelting

4.Bessemerization

Question 4 of 10

Question 5 of 10

5. Which of the followings is not a raw material for the manufacture of soda ash.

1.Brine

2.Ammonia

3.Lime stone

4.Carbon monoxide

Question 5 of 10

Question 6 of 10

6. What happens when ammonium carbonate is distilled with steam?

1.Carbon dioxide is released

2.Urea solution is produced

3.Urea is produced

4.Ammonia is produced

Question 6 of 10

Question 7 of 10

7. Chemical formula of slaked lime is

1.CaCl₂

2.CaCO₃

3.CaO

4.Ca(OH)₂

Question 7 of 10

Question 8 of 10

8. Percentage of nitrogen in urea is

1.21.2

2.46.6

3.35

4.80

Question 8 of 10

Question 9 of 10

9. The naturally occurring metallic compounds are called as

1.Mineral

2.Ore

3.Gangue

4.Rock

Question 9 of 10

Question 10 of 10

10. The separation of minerals from gangue is called concentration. Which of the following methods is used for concentration?

1.Refining

2.Roasting

3.Flotation

4.Smelting

Question 10 of 10

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