MetallurgyHard
Question
In the leaching of Ag2S with NaCN, a stream of air is also passed. It is because of :
Options
A.reversible nature of reaction between Ag2S and NaCN
B.to oxidise Na2S formed into Na2SO4 and sulphur
C.both (A) and (B)
D.None of the above
Solution
Ag2S + 2NaCN 
2AgCN + Na2S
4Na2S + 5O2 + 2H2O → 2Na2SO4 + 4NaOH + 2S.
2AgCN + Na2S 4Na2S + 5O2 + 2H2O → 2Na2SO4 + 4NaOH + 2S.
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