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​

Answers 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

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