Which of the following metals can be extracte | vedclass

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(D) The alkali leaching process is commonly used for the extraction of $Al$ (from bauxite ore) and $Au$ or $Ag$ (from their respective ores).In the ca

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$Au$

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(D) The alkali leaching process is commonly used for the extraction of $Al$ (from bauxite ore) and $Au$ or $Ag$ (from their respective ores).In the case of gold $(Au)$,the ore is treated with a dilute solution of sodium cyanide $(NaCN)$ in the presence of air $(O_2)$,which acts as a source of oxygen.The chemical reaction is: $4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$.Thus,$Au$ is extracted using this leaching technique.

Which of the following metals can be extracted through alkali leaching technique?

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