A) \[{{O}_{2}}\] and CO respectively
B) \[{{O}_{2}}\] and Zn dust respectively
C) \[HN{{O}_{3}}\] and Zn dust respectively
D) \[HN{{O}_{3}}\] and CO respectively
Correct Answer: B
Solution :
The reactions involved in extraction of silver by cyanide process are \[A{{g}_{2}}S+C{{N}^{-}}+{{O}_{2}}\to {{[Ag{{(CN)}_{2}}]}^{-}}+S{{O}_{2}}\]...... (i) \[{{[Ag{{(CN)}_{2}}]}^{-}}+Zn\to {{[Zn{{(CN)}_{4}}]}^{2-}}+Ag\]...... (ii) In reaction (i), sulphide is oxidized to \[S{{O}_{2}}\] by oxygen. In the reaction (ii), silver ion \[(A{{g}^{+}})\] is reduced to Ag by Zn. Therefore, \[{{O}_{2}}\]is oxidising agent and Zn is reducing agent.
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