The metal extracted by leaching with a cyanid | vedclass

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(B) The metal extracted by leaching with a cyanide is $Ag$ (or $Au$).In the Mac-Arthur Forest process,silver $(Ag)$ or gold $(Au)$ ores are treated wi

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$Ag$

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(B) The metal extracted by leaching with a cyanide is $Ag$ (or $Au$).In the Mac-Arthur Forest process,silver $(Ag)$ or gold $(Au)$ ores are treated with a dilute solution of $NaCN$ in the presence of air $(O_2)$.The chemical reaction is: $4M + 8CN^- + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^-$.Subsequently,the metal is recovered by displacement using a more electropositive metal like zinc $(Zn)$: $2[M(CN)_2]^- + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$.

The metal extracted by leaching with a cyanide is

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