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Question

Extraction of gold and silver involves leaching the metal with CN ion. The metal is recovered by ________________.


A

calcination followed by roasting.

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B

thermal decomposition of metal complex.

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C

displacement of metal by some other metal from the complex ion.

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D
roasting of metal complex.
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Solution

The correct option is C

displacement of metal by some other metal from the complex ion.


Extraction of gold and silver involves leaching the metal with CN ion. The metal is recovered by displacement of metal by some other metal from the complex ion.

The reactions are involved:

Here, Zn acts as a reducing agent.

So, the correct answer is option (a).


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