NEET | 2017MetallurgyHard

Question

Extraction of gold and silver involes leaching with CN–ion. Silver is later recovered by :-

Options

A.

distillation

B.

zone refining

C.

displacement with Zn

D.

liquation

Solution

Mac arther forest process/cyanide process
Ag2S + 4NaCN →O2 2Na[Ag(CN)2]+ Na2SO4
2Na[Ag(CN)2] →Zn Na2[Zn(CN)4]+Ag (↓)
                                             Soluble complex
Ag extracts by displacement with Zn
 

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