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The sodium extract of an organic compound gives a violet colour with a freshly prepared solution of sodium nitroprusside. The element present is

Anitrogen
Bchlorine
Cphosphorus
Dsulphur

Answer: D

Sulphide ions (

S X^{2 -}

) of the sodium extract react with sodium nitroprusside to give a violet complex,

Na X_{4} [Fe (CN) X_{5} NOS]

. This is the specific test for sulphur.

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