The process of the isolation of a metal by di | vedclass

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(A) The process described is known as $hydrometallurgy$. In this process,the ore is treated with a suitable chemical reagent (like an aqueous solution

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hydrometallurgy

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(A) The process described is known as $hydrometallurgy$. In this process,the ore is treated with a suitable chemical reagent (like an aqueous solution of $NaCN$ or $KCN$ in the case of gold or silver) to dissolve the metal as a complex. The metal is then recovered from this solution by adding a more electropositive metal (like $Zn$),which acts as a reducing agent to precipitate the noble metal. For example,in the extraction of gold: $4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$ followed by $2[Au(CN)_2]^-(aq) + Zn(s) \rightarrow 2Au(s) + [Zn(CN)_4]^{2-}(aq)$.

The process of the isolation of a metal by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called:

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