In the process of extraction of gold,Roasted | vedclass

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(A) The extraction of gold involves the leaching of gold ore with a dilute solution of $CN^-$ in the presence of air (source of $O_2$),which acts as a

Vedclass · Accepted Answer

$[x] = [Au(CN)_2]^-, [y] = [Zn(CN)_4]^{2-}$

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(A) The extraction of gold involves the leaching of gold ore with a dilute solution of $CN^-$ in the presence of air (source of $O_2$),which acts as an oxidizing agent.The chemical reaction is:$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$Here,$[x] = [Au(CN)_2]^-$.Gold is then recovered from the complex by displacement using zinc,which is a more reactive metal:$2[Au(CN)_2]^-(aq) + Zn(s) \rightarrow [Zn(CN)_4]^{2-}(aq) + 2Au(s)$Here,$[y] = [Zn(CN)_4]^{2-}$.

In the process of extraction of gold,
Roasted gold ore $+ CN^{-} + H_2O \xrightarrow{O_2} [x] + OH^{-}$;
$[x] + Zn \rightarrow [y] + Au$
$[x]$ and $[y]$ are :

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In the process of extraction of gold,Roasted gold ore $+ CN^{-} + H_2O \xrightarrow{O_2} [x] + OH^{-}$;$[x] + Zn \rightarrow [y] + Au$$[x]$ and $[y]$ are :