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  4. The formula of compound which gives violet colour in Lassaignes test for sulphur with sodium nitroprusside is

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Q. The formula of compound which gives violet colour in Lassaignes test for sulphur with sodium nitroprusside is

CMC MedicalCMC Medical 2008

Solution:

Sodium thionitroprusside, $ N{{a}_{4}}[Fe{{(CN)}_{5}}NOS] $ gives violet colour in Lassagines test for sulphur with sodium nitroprusside. $ \underset{\text{sodium}\,\,\text{extract}}{\mathop{N{{a}_{2}}S}}\,+\underset{\text{sodium}\,\,\text{nitroprusside}}{\mathop{N{{a}_{2}}[Fe{{(CN)}_{5}}NO]}}\,\xrightarrow{{}} $ $ \underset{\text{purple}\,\,\text{(violet)}\,\,\text{colour}}{\mathop{N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]}}\, $