Question

For detection of sulphur in an organic
compound sodium nitroprusside is added to
the sodium extract. A violet colour is obtained
due to formation of
(A) Fe(CN)2
(B) K3Fe(CN)5NS
(C) Na4 [Fe(CN)5NOS]
(D) Na4Fe(CN)6​

Answer 1

In order to detect Sulphur in an organic compound, Sodium Nitroprusside is added to an extract of Sodium. Thereafter, a violet hue is released. This is because, the sodium fusion will convert the same into sodium sulphide; and these Sulphide ions can be easily identified with the help of Sodium Nitroprusside.

Therefore, the equation is given as follows :-

$S^2^- + [Fe(CN)_5NO]^2^-$ →  $[FE(CN)_5NOS]^4^-$

Ans) (C) $Na_4 [Fe(CN)_5NOS]$