Which metal is leached from its ore by the use of $K C N$

Copper

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Zinc

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Gold

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Iron

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Solution

The correct option is D Gold
Silver and gold are extracted by the cyanide process (Mac Arthur - Forrest process). After the preliminary crushing and concentration by froth floatation process, the ore (crushed auriferous rocks in the case of gold) is leached with dilute (0.4 - 7%) solution of sodium cyanide made alkaline by adding lime kept agitated by a current of air. Silver (or gold) pass into solution as argentocyanide (or aurocyanide).

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Which metal is leached from its ore by the use of KCN

Which metal is leached from its ore by the use of $K C N$