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

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Question 1 of 10

Chemistry

1. Percentage of nitrogen in urea is

1.80

2.21.2

3.35

4.46.6

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.Electrolytic tank

4.Copper sulphate

Question 2 of 10

Question 3 of 10

3. The naturally occurring metallic compounds are called as

1.Gangue

2.Rock

3.Ore

4.Mineral

Question 3 of 10

Question 4 of 10

4. Chemical formula of slaked lime is

1.CaCl₂

2.Ca(OH)₂

3.CaCO₃

4.CaO

Question 4 of 10

Question 5 of 10

5. 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.CO₂

3.CO

4.H₂O

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.Lime stone

2.Carbon monoxide

3.Ammonia

4.Brine

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.Roasting

2.Smelting

3.Flotation

4.Refining

Question 7 of 10

Question 8 of 10

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

1.Bessemerization

2.Roasting

3.Smelting

4.Flotation

Question 8 of 10

Question 9 of 10

9. 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.Bessemerization

2.Smelting

3.Roasting

4.Electro-refining

Question 9 of 10

Question 10 of 10

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

1.Urea is produced

2.Urea solution is produced

3.Carbon dioxide is released

4.Ammonia is produced

Question 10 of 10

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