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.Smelting

2.Roasting

3.Electro-refining

4.Bessemerization

Question 1 of 10

Question 2 of 10

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

1.Smelting

2.Flotation

3.Bessemerization

4.Roasting

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.CO

2.H₂O

3.CO₂

4.Na₂CO₃

Question 3 of 10

Question 4 of 10

4. The naturally occurring metallic compounds are called as

1.Rock

2.Gangue

3.Mineral

4.Ore

Question 4 of 10

Question 5 of 10

5. Chemical formula of slaked lime is

1.Ca(OH)₂

2.CaCl₂

3.CaCO₃

4.CaO

Question 5 of 10

Question 6 of 10

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

1.Brine

2.Ammonia

3.Carbon monoxide

4.Lime stone

Question 6 of 10

Question 7 of 10

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

1.Smelting

2.Roasting

3.Flotation

4.Refining

Question 7 of 10

Question 8 of 10

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

1.Copper sulphate

2.Pure copper

3.Electrolytic tank

4.Impure copper

Question 8 of 10

Question 9 of 10

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

1.Ammonia is produced

2.Urea is produced

3.Carbon dioxide is released

4.Urea solution is produced

Question 9 of 10

Question 10 of 10

10. Percentage of nitrogen in urea is

1.46.6

2.21.2

3.35

4.80

Question 10 of 10

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