Q.

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

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a

O2 and CO respectively

b

O2 and Zn dust respectively

c

HNO3 and Zn dust respectively

d

HNO3 and CO respectively

answer is B.

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Detailed Solution

The reactions involved in extraction of silver by cyanide process areAg2S+CN−+O2⟶Ag(CN)2+SO2...........(i)Ag(CN)2+Zn⟶Zn(CN)42−+Ag........(ii)In reaction (i), sulphide is oxidised to SO2 by oxygen.In the reaction (ii), silver ion (Ag+) is reduced to Ag by Zn.Therefore,O2 is oxidising agent and Zn is reducing agent.
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