1.

Extraction of gold and silver involves leaching with `CN^(-)`ion.silver is later recovered by:A. distillationB. zone refiningC. displacement with `Zn`D. liquation

Answer» Correct Answer - 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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