Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by ______.

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Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by displacement of metal by some other metal from the complex ion. Explanation: The metal in cyanide process is recovered by displacement of metal by some more reactive metal from the complex. The metal is later recovered by displacement method. \ce{4M + 8CN^{-} + 2H2O + O2 -> 4[M(CN)2]^{-} + 4OH^{-}} \ce{2[M(CN)2]^{-} + Zn -> [Zn(CN)4]^{2-} + 2M}

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