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(D) The cyanide process,also known as the Mac-Arthur Forrest process,is used for the extraction of gold $(Au)$ and silver $(Ag)$ from their ores. In t

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Both $(A)$ and $(B)$

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(D) The cyanide process,also known as the Mac-Arthur Forrest process,is used for the extraction of gold $(Au)$ and silver $(Ag)$ from their ores. In this process,the crushed ore is treated with a dilute solution of sodium cyanide $(NaCN)$ in the presence of air $(O_2)$,which acts as an oxidizing agent. The metal dissolves in the cyanide solution to form a soluble complex: $4M + 8CN^- + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^-$ (where $M = Au$ or $Ag$). Therefore,both $Au$ and $Ag$ are extracted using this method.

The cyanide process is used for the extraction of which of the following?

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