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General Principles and processes of Isolation of Elements
hard
In the leaching of $Ag_2S$ with $NaCN,$ a stream of air is also passed. It is because of
A
reversible nature of reaction between $Ag_2S$ and $NaCN$
B
to oxide $Na_2S$ formed into $Na_2SO_4$ and sulphur
C
both $(A)$ and $(B)$
D
none of the above
Solution
The reaction between silver sulphide and sodium cyanide is reversible.
When a stream of air is passed, sodium sulfide is oxidized to sodium sulphate.
This prevents the backward reaction.
Standard 12
Chemistry
