Refining of Metals

Q.

Metals like copper and silver are refined by:

1. leaching

2. distillation

3. calcination

4. electrolytic refining

Q.

Which of the following salt solution is used as an electrolyte in the electrolytic refining of copper metal?

1. Copper sulphate

2. Zinc sulphate

3. Sodium chloride

4. Copper metal

Q. _______ is an alloy of copper and tin.

1. Gold
2. Steel
3. Bronze
4. Brass

Q. Which of the following metal is refined by liquation process?

1. Iron
2. Zinc
3. Mercury
4. Lead

Q. Which of the following metal is refined by distillation?

1. Mercury
2. Copper
3. Iron
4. Tin

Q. The process of obtaining pure metal from an impure metal is known as _______.

1. concentration
2. refining
3. alloying
4. extraction

Q. Match the following concentration methods with the principle behind them.

1. Specific gravity
2. Magnetic property
3. Differential wetting property

Q. Match the alloys with their constituent elements.

1. Copper and tin
2. Zinc and copper
3. Iron and carbon

Q. The number of electrons gained by the anode is equal to the number of electrons donated by the cathode.

1. True
2. False

Q. Which of the following salt solution is used as an electrolyte in the electrolytic refining of copper metal?

1. Copper sulphate
2. Zinc sulphate
3. Sodium chloride
4. Copper metal