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(D) Leaching of $Ag_2S$ is carried out by treating it with a dilute solution of $NaCN$ in the presence of air $(O_2)$ as an oxidizing agent.The chemic

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$NaCN$ in presence of $O_2$

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(D) Leaching of $Ag_2S$ is carried out by treating it with a dilute solution of $NaCN$ in the presence of air $(O_2)$ as an oxidizing agent.The chemical reaction is:$Ag_2S + 4NaCN \rightleftharpoons 2Na[Ag(CN)_2] + Na_2S$Since the reaction is reversible,the presence of $O_2$ oxidizes the sulphide ion $(S^{2-})$ to sulphur or sulphate,shifting the equilibrium to the right:$2Na_2S + 2H_2O + O_2 \rightarrow 4NaOH + 2S$This forms a soluble complex,$Na[Ag(CN)_2]$.Finally,silver is recovered by displacement using zinc:$2Na[Ag(CN)_2] + Zn \rightarrow Na_2[Zn(CN)_4] + 2Ag \downarrow$

Leaching of $Ag_2S$ is carried out by heating it with a dilute solution of

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