Question

14. Which processes are adopted to extract Zn from ZnS ? (A) Roasting and electrolytic refining (B) Roasting and calcination (C) Only roasting (D) Only calcination​

Answer 1

Answer:

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Explanation:

(i) ZnS is roasted in excess air at 1200 K to form ZnO.

2ZnS+2O

2

Δ

2ZnO+2SO

2

(ii) ZnO is heated with crushed coke at 1673 K, where it is reduced to Zn.

ZnO+C

1676K

Zn+CO

(iii) Electrorefining is carried out for refining of impure zinc. Anode is impure zinc and cathode is pure zinc. Electrolyte is a mixture of zinc sulphate and dilute sulphuric acid (small amount). When current is passed, zinc is deposited on cathode and is collected.

At anode : Zn→Zn

2+

+2e

−

At cathode: Zn

2+

+2e

−

→Zn

Answer 2

The correct option regarding the processes used to extract Zn from ZnS is (A) Roasting and electrolytic refining.

• During the extraction of metal from its ore, it undergoes many processes.
• It involves grinding, beneficiation, or ore dressing, conversion into oxides using roasting or calcination, reduction of oxides to metals, and then electrolytic refining.
• Grinding is the breaking of ore into smaller pieces, calcination is carried out to convert carbonates into oxides in a limited supply of air.
• Similarly, roasting is used for the conversion of sulfides to oxides over the air.
• $2ZnS+3O2→2ZnO+2SO2$
• Now, zinc oxide is converted to zinc metal using carbon. $zno + c→zn + co$
• Now, the electrolytic beginning is done to get pure zinc metal from impure zinc metal obtained after reduction with carbon.

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