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

Uttarkhand PMTUttarkhand PMT 2005

Solution:

If sulphur is present in the organic compound, sodium fusion will convert it into sodium sulphide. Sulphide ions are readily identified using sodium nitroprusside.
$Na + S \rightarrow Na _{2} S $
$ Na _{2} S + Na _{2}\left[ Fe ( CN )_{5} NO \right] \rightarrow Na _{4}\left[ Fe ( CN )_{5} NOS \right]$