Question

Extraction of gold and silver involves leaching with CN- ion.Silver is later recovered by(with explanation)

a) distillation
b) zone refining
c) displacement with Zn
d) liquation​

Answer 1

Answer:

Option C is the 100% correct answer

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Answer 2

Answer:

C) displacement with Zn

Explanation:

Extraction of gold and silver involves leaching with CN− and the metals silver and gold are later recovered by displacement method.

4M + 8CN- +2H₂O + O₂ = 4 [M(CN)₂]− + 4OH−

2[M(CN)₂]− + Zn = 2M + [Zn(CN)₄]²−

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