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  4. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to

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Q. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to

AFMCAFMC 2012

Solution:

$Fe ( CNS )_{3}$ is red in colour and is formed when both $N$ and $S$ are present in organic compound.
$\underset{\text { form organic compound }}{ Na _{2}S}+ \underset{\text{Sodium nitroprusside}}{Na _{2}\left[ Fe ( CN )_{5} NO \right]} \longrightarrow \underset{\text{violet colour}}{\left[ Na _{3} Fe ( CN )_{5} NOS \right]}$