The cyanide process is used for obtaining

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(B) The cyanide process,also known as the Mac-Arthur Forrest process,is primarily used for the extraction of noble metals like $Ag$ (silver) and $Au$

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$Ag$

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(B) The cyanide process,also known as the Mac-Arthur Forrest process,is primarily used for the extraction of noble metals like $Ag$ (silver) and $Au$ (gold) from their ores.In this process,the crushed ore is treated with a dilute solution of $NaCN$ or $KCN$ in the presence of air (as a source of $O_2$),which dissolves the metal as a cyano-complex.For silver $(Ag)$: $4Ag(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Ag(CN)_2]^-(aq) + 4OH^-(aq)$.The metal is then recovered from the complex by displacement with a more electropositive metal like $Zn$.

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