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

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

NTA AbhyasNTA Abhyas 2022

Solution:

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are $O_{2}$ and Zn dust respectively.
$\left(\text{Ag}\right)_{2}\text{S}+2\left(\text{CN}\right)^{-}+\left(\text{O}\right)_{2} \rightarrow 2\left(\left[\text{Ag} \left(\right. \text{CN} \left.\right)_{2}\right]\right)^{-}+\left(\text{SO}\right)_{2}$
$2\left(\left[\text{Ag} \left(\right. \text{CN} \left.\right)_{2}\right]\right)^{-}+\text{Zn} \rightarrow \left(\left[\text{Zn} \left(\right. \text{CN} \left.\right)_{4}\right]\right)^{2 -}+2\text{Ag}$