The metal which is extracted by oxidation and | vedclass

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Question

(B) The metal is $Ag$ (Silver). In the extraction of silver,the ore is treated with a dilute solution of $NaCN$ or $KCN$ in the presence of air $(O_2)

Vedclass · Accepted Answer

$Ag$

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(B) The metal is $Ag$ (Silver). In the extraction of silver,the ore is treated with a dilute solution of $NaCN$ or $KCN$ in the presence of air $(O_2)$,which acts as an oxidizing agent to dissolve the metal as a complex: $4Ag + 8CN^{-} + O_2 + 2H_2O \rightarrow 4[Ag(CN)_2]^{-} + 4OH^{-}$ Subsequently,the metal is recovered from the complex by displacement using a more electropositive metal like zinc $(Zn)$,which acts as a reducing agent: $2[Ag(CN)_2]^{-} + Zn \rightarrow 2Ag \downarrow + [Zn(CN)_4]^{2-}$

The metal which is extracted by oxidation and subsequent reduction from its ore is:

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