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NEET levelSingle correct optionDifficulty 1 of 3qa168

A few drops of freshly prepared sodium nitroprusside solution are added to an alkaline solution of sodium sulphide. The colour developed is

Apale green
Bdeep (Prussian) blue
Cblood red
Dpurple (violet)

Answer: D

Sulphide ion attacks the coordinated NO of

[Fe (CN) X_{5} NO] X^{2 -}

in alkaline medium. This gives the purple complex

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

, which is the confirmatory test for sulphide.

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