Questions
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
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Correct option is B
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.Similar Questions
The ores that are concentrated by leaching process are
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