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In the leaching of \( \mathrm{Ag}_{2} \mathrm{~S} \) with \( \mathrm{NaCN} \), a stream of air is also passed. It is because of :
\( \mathrm{P} \)
(a) ieversible nature of reaction between \( \mathrm{Ag}_{2} \mathrm{~S} \) and \( \mathrm{NaCN} \)
(b) to oxide \( \mathrm{Na}_{2} \mathrm{~S} \) formed into \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) and sulphur
\( \mathrm{W} \)
(c) both (a) and (b)
(d) none of the above
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