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The oxidising and reducing agents respec...

The oxidising and reducing agents respectively for the cyanide extraction of silver from argentite ore are

A

`O_(2),CO`

B

`HN_(3),CO`

C

`O_(2),Zn` dust

D

`HN_(3),Zn` dust

Text Solution

Verified by Experts

The correct Answer is:
C
`Ag+CN^(-)(aq)+H_(2)O+O_(2)rarr[Ag(CN)_(2)]^(-)(aq)+OH^(-)`
`[Ag+(CN_(2))^(-) aq + Zn(s)rarrAg(s)+ [Zn(CN_(4))]^(2-)(aq)`
So, for the extration of `AgO_(2)` act as oxidising agent and Zn dust act as reducing agent.
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