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(B) In the cyanide process for the extraction of silver,the ore is treated with a dilute solution of $NaCN$ in the presence of air to form a soluble c

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reducing agent

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(B) In the cyanide process for the extraction of silver,the ore is treated with a dilute solution of $NaCN$ in the presence of air to form a soluble complex: $4Ag + 8CN^- + 2H_2O + O_2 \rightarrow 4[Ag(CN)_2]^- + 4OH^-$. Zinc is then added to this solution to displace silver from the complex: $2[Ag(CN)_2]^- + Zn \rightarrow [Zn(CN)_4]^{2-} + 2Ag$. In this reaction,$Zn$ is oxidized to $Zn^{2+}$ and $Ag^+$ is reduced to $Ag$. Therefore,zinc acts as a reducing agent.

In the cyanide process involving the extraction of silver,zinc is used industrially as a(an)

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