Refining

Q.

What are the various steps involved in metallurgy?

Q. Write the principle of liquation.

Q. The process of obtaining the pure metal from the impure metal is called ___.

Q.

Calcination or Roasting will be done for the products of the smelting process to remove impurities.

1. True

2. False

Q.

Which of the following gas is produced by roasting iron pyrites in air?

1. SO₂

2. SO₃

3. O₂

4. H₂S

Q.

Smelting is a pyro refining process.

1. True

2. False

Q. Which of the following metals are extracted from its ore by using self-reduction method?

1. Copper
2. Mercury
3. Lead
4. Silver

Q.

Which of the following can be termed as refining?

1. Baeyer’s process

2. Var Arkel – de Boer Process

3. Levigation

4. Smelting

Q. The general process flow in metallurgy of zinc blende is:

1. Mining
2. Froth flotation
3. Roasting
4. Reduction
5. Refining

Q. Metals with low melting points can be refined by the process of.

1. distillation
2. liquation
3. froth flotation

Q. Calcination is the process of heating the ore ______________.

1. in inert gas
2. in the presence of air
3. in the presence of CaO and MgO
4. in the absence air

Q. Four metals and their methods of refinement are given.
(i) $Ni,Cu,Zr,Ga$
(ii) Electrolysis, Van Arkel process, zone refining, Mond's process

1. $Ni$; Mond's process, $Cu$; Electrolysis, $Zr$; Van Arkel process, $Ga$; Zone refining
2. $Ni$; Electrolysis, $Cu$; Van Arkel process, $Zr$; Zone refining, $Ga$; Mond's process
3. $Ni$; Mond's process, $Cu$; Van Arkel process, $Zr$; Zone refining. $Ga$; Electrolysis
4. $Ni$; Electrolysis, $Cu$; Zone refining, $Zr$; Van Arkel process, $Ga$; Mond's process

Q.

28. X and Y are gases at room temperature. X is less reactive and is used to preserve food material, while Y is required for combustion. Metal M gets corroded when it combines with Y in the presence of Z. An atom of M possesses 14 electrons in the second last shell and N is the last shell. Identify X, Y, Z and M.

Q. Identify the reducing agent in the following reaction :

Q. During the process of smelting, an additional substance is added which combines with impurities to form a fusible product in metal extraction. It is known as:

1. Slag
2. Mud
3. Gangue
4. Flux