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In the leaching of Ag(2)S with NaCN, a s...

In the leaching of `Ag_(2)S` with `NaCN`, a stream air is also passed. It is because of

A

the reaction between ` Ag_2 S and NaCN ` is reversible

B

to oxidise ` Na_2 S ` formed in the reaction to ` Na_2 SO _ 4 `

C

to oxide ` Ag_2 S ` to ` Ag_2O `

D

both (a) and (b)

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The correct Answer is:
D
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