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Explain the use of the following : (a) N...

Explain the use of the following : (a) NaCN in Froth Floatation Method.
(b) Carbon monoxide in Mond process.
(c) Coke in the extraction of Zinc from Zinc Oxide

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(a) NaCN is used as depressants to separate two sulphide ores (ZnS and PbS) in Froth Floatation Method.
(b) Carbon monoxide forms a volatile complex of nicked, nickel tetracarbonyl.
(c) Coke is used as a reducing agent to reduce zinc oxide to zinc.
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