During the extraction of gold,the following r | vedclass

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(D) The extraction of gold involves the leaching of gold with a cyanide solution in the presence of air $(O_2)$: $4Au + 8CN^{-} + 2H_2O + O_2 \longrig

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$[Au(CN)_2]^{-}$ and $[Zn(CN)_4]^{2-}$

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(D) The extraction of gold involves the leaching of gold with a cyanide solution in the presence of air $(O_2)$: $4Au + 8CN^{-} + 2H_2O + O_2 \longrightarrow 4[Au(CN)_2]^{-} + 4OH^{-}$ In this reaction,the gold is oxidized to the complex $[Au(CN)_2]^{-}$. Next,the gold is recovered from the complex by displacement with zinc: $2[Au(CN)_2]^{-} + Zn \longrightarrow 2Au + [Zn(CN)_4]^{2-}$ Comparing these with the given reactions,$X$ is $[Au(CN)_2]^{-}$ and $Y$ is $[Zn(CN)_4]^{2-}$.

During the extraction of gold,the following reactions take place: $4Au + 8CN^{-} + 2H_2O + O_2 \longrightarrow 4[Au(CN)_2]^{-} + 4OH^{-}$ and $2[Au(CN)_2]^{-} + Zn \longrightarrow [Zn(CN)_4]^{2-} + 2Au$. $X$ and $Y$ are respectively:

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