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

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In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents are
A. `O_(2)andCO` respectively
B. `O_(2)andZn` dust resper
C. `HNO_(3)andZn` dust respectively
D. `HNO_(3)andCO` respectively
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Correct Answer - B
IN extraction of silver `Ag_(2)`, S is leacyhed with KCN in presence of air :
`Ag_(2)S+NaCN+O_(2)hArrNa[Ag(CN)_(2)]+Na_(2)S_(2)O_(3)`
Thus, `O_(2)` is oxidant.
`2[Ag(CN)_(2)]^(-)+Zn to [Zn(CN_(4))]^(2-)+2Agdarr`
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