In the cyanide extraction process of silver f | vedclass

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Question

(B) In the extraction of silver,argentite ore $(Ag_2S)$ is leached with a dilute solution of $NaCN$ in the presence of air $(O_2)$:$Ag_2S + 4NaCN + \f

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$O_2$ and $Zn$ dust respectively

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(B) In the extraction of silver,argentite ore $(Ag_2S)$ is leached with a dilute solution of $NaCN$ in the presence of air $(O_2)$:$Ag_2S + 4NaCN + \frac{1}{2}O_2 + H_2O \longrightarrow 2Na[Ag(CN)_2] + S + 2NaOH$Here,$O_2$ acts as an oxidizing agent to facilitate the dissolution of silver.Then,the silver is recovered from the complex by adding zinc dust,which acts as a reducing agent:$2[Ag(CN)_2]^- + Zn \longrightarrow [Zn(CN)_4]^{2-} + 2Ag$Thus,$O_2$ is the oxidizing agent and $Zn$ dust is the reducing agent.

In the cyanide extraction process of silver from argentite ore,the oxidizing and reducing agents used are

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