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(B) The extraction of $Ag$ from argentite $(Ag_2S)$ involves the following steps:$1$. Leaching: $Ag_2S + 4NaCN + \frac{1}{2}O_2 \rightarrow 2Na[Ag(CN)

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$O_2$ and $Zn$ powder

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(B) The extraction of $Ag$ from argentite $(Ag_2S)$ involves the following steps:$1$. Leaching: $Ag_2S + 4NaCN + \frac{1}{2}O_2 \rightarrow 2Na[Ag(CN)_2] + Na_2S$. Here,$O_2$ acts as an oxidizing agent.$2$. Displacement: $2Na[Ag(CN)_2] + Zn \rightarrow Na_2[Zn(CN)_4] + 2Ag$. Here,$Zn$ acts as a reducing agent.Thus,$O_2$ is the oxidizing agent and $Zn$ powder is the reducing agent.

In the cyanide process for the extraction of $Ag$ from argentite,the oxidizing agent and reducing agent used are respectively:

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