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

Answer» Correct Answer - C
`4 Ag + 8 NaCN + 2 H_(2) O + O_(2)`
`rarr 4 Na [Ag (CN)_(2)] + 4 NaOH`
`2[Ag (CN)_(2)]^(-) (aq) + Zn (s)`
`rarr 2 Ag (s) + [Zn (CN)_(4)]^(2-) (aq)`


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