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

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Question 1 of 10

Chemistry

1. The naturally occurring metallic compounds are called as

1.Rock

2.Mineral

3.Ore

4.Gangue

Question 1 of 10

Question 2 of 10

2. Chemical formula of slaked lime is

1.CaCl₂

2.Ca(OH)₂

3.CaCO₃

4.CaO

Question 2 of 10

Question 3 of 10

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

1.Smelting

2.Flotation

3.Refining

4.Roasting

Question 3 of 10

Question 4 of 10

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

1.Na₂CO₃

2.H₂O

3.CO

4.CO₂

Question 4 of 10

Question 5 of 10

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

1.Urea is produced

2.Ammonia is produced

3.Carbon dioxide is released

4.Urea solution is produced

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.Ammonia

2.Brine

3.Carbon monoxide

4.Lime stone

Question 6 of 10

Question 7 of 10

7. 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.Electro-refining

2.Bessemerization

3.Roasting

4.Smelting

Question 7 of 10

Question 8 of 10

8. Percentage of nitrogen in urea is

1.21.2

2.80

3.46.6

4.35

Question 8 of 10

Question 9 of 10

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

1.Copper sulphate

2.Pure copper

3.Impure copper

4.Electrolytic tank

Question 9 of 10

Question 10 of 10

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

1.Flotation

2.Bessemerization

3.Roasting

4.Smelting

Question 10 of 10

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