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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 |
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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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