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Extraction of gold and silver involves l...

Extraction of gold and silver involves leaching with `CN^(-)`ion.silver is later recovered by:

A

distillation

B

zone refining

C

displacement with `Zn`

D

liquation

Text Solution

Verified by Experts

The correct Answer is:
C
Mac arther forest process`//`cyanide process
`Ag_(2)S +4NaCNoverset(O_(2))rarr2Na[Ag(CH)_(2)]+NaSO_(4)`
`2Na[Ag(CN)_(2)]underset(Zn)rarrNa_(2)underset("Soluble complex")([Zn(CN)_(4)]+Ag(darr))`
`Ag` extractes by displacement with `Zn`
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