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Sulphur

For detection...

Question

For detection of sulphur in an organic compound, sodium nitroprusside is added to the lassaigne's filtrate the ppt. obtained as:

A

purple colour

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B

black colour

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C

blood-Red colour

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D

white colour

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Solution

The correct option is A purple colour
$N a_{2} S Lassaigne's filtrate + N a_{2} [F e (N O) (C N)_{5}] sodium nitroprusside \to N a_{4} [F e (C N)_{5} N O S] sodium thronitropruss (purple colour)$

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