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Question

Write chemical reactions taking place in the extraction of zinc from zinc blende.

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Solution

During extraction of Zn from zinc blende (ZnS), following reactions occur:
(i) ZnS is roasted in excess air at 1200 K to form ZnO.
2ZnS+2O2Δ2ZnO+2SO2
(ii) ZnO is heated with crushed coke at 1673 K, where it is reduced to Zn.
ZnO+C1676K−−−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 : ZnZn2++2e
At cathode: Zn2++2eZn

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