In the leaching of Ag2S with NaCN, a stream of air is also passed. It is because of

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Reversible nature of reaction between Ag2S and NaCN

Oxidises Na2S into Na2SO4

Irreversible nature of reaction between Ag2S and NaCN

None of the above

answer is A.

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Detailed Solution

Ag2S+4NaCN⇌2Na[Ag(CN)2]+Na2SThe air blown removes sodium sulphide 4Na2S+5O2+2H2O→2Na2SO4+4NaOH+2S

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