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(C) The extraction of silver and gold involves the cyanide process (MacArthur-Forrest process). First,the ore is leached with $NaCN$ in the presence o

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displacement with $Zn$

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(C) The extraction of silver and gold involves the cyanide process (MacArthur-Forrest process). First,the ore is leached with $NaCN$ in the presence of air $(O_2)$ to form a soluble complex: $Ag_{2}S + 4 NaCN \xrightarrow{O_{2}} 2 Na[Ag(CN)_{2}] + Na_{2}SO_{4}$ Then,the silver is recovered from the solution by displacement using a more electropositive metal like zinc $(Zn)$: $2 Na[Ag(CN)_{2}] + Zn \longrightarrow Na_{2}[Zn(CN)_{4}] + 2Ag(\downarrow)$ Thus,silver is recovered by displacement with $Zn$.

Extraction of gold and silver involves leaching with $CN^{-}$ ion. Silver is later recovered by

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