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Question:
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
Updated On: Jun 14, 2022
- $O_2$ and $CO$ respectively
- $O_2$ and $Zn$ dust respectively
- $HNO_3$ and $Zn$ dust respectively
- $HNO_3$ and $CO$ respectively
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The Correct Option is B
Solution and Explanation
The reactions involved in extraction of silver by cyanide process are
$Ag_2S+CN^-+O_2\rightarrow [Ag(CN)_2]^-+SO_2$...(i)
$[Ag(CN)_2]^-+Zn\rightarrow [Zn(CN)_4]^{2-}+Ag$...(ii)
In reaction (i), sulphide is oxidised to $S0_2$ by oxygen. In the reaction (ii), silver ion $(Ag^+)$ is reduced to Ag by Zn. Therefore, $O_2$ is oxidising agent and Zn is reducing agent.
$Ag_2S+CN^-+O_2\rightarrow [Ag(CN)_2]^-+SO_2$...(i)
$[Ag(CN)_2]^-+Zn\rightarrow [Zn(CN)_4]^{2-}+Ag$...(ii)
In reaction (i), sulphide is oxidised to $S0_2$ by oxygen. In the reaction (ii), silver ion $(Ag^+)$ is reduced to Ag by Zn. Therefore, $O_2$ is oxidising agent and Zn is reducing agent.
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Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
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