Leaching of gold with dilute aqueous solution | vedclass

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Question

(C) The leaching process of gold involves the formation of the dicyanoaurate$(I)$ complex $[A]$: $4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow

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

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(C) The leaching process of gold involves the formation of the dicyanoaurate$(I)$ complex $[A]$: $4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$. Here,$[A]$ is $[Au(CN)_2]^-$. Next,the displacement reaction with zinc occurs: $2[Au(CN)_2]^-(aq) + Zn(s) \rightarrow [Zn(CN)_4]^{2-}(aq) + 2Au(s)$. Here,$[B]$ is $[Zn(CN)_4]^{2-}$. Thus,$[A]$ and $[B]$ are $[Au(CN)_2]^-$ and $[Zn(CN)_4]^{2-}$ respectively.

Leaching of gold with dilute aqueous solution of $NaCN$ in presence of oxygen gives complex $[A]$,which on reaction with zinc forms the elemental gold and another complex $[B]$. $[A]$ and $[B],$ respectively are ...... .

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