Q.

Sodium nitroprusside when added to an alkaline solution of sulphide ions produces

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a

Brown colour

b

Purple colour

c

Red colour

d

Blue colour

answer is C.

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Detailed Solution

In an alkaline sulphide ion solution, the addition of sodium nitroprusside results in the production of the purple sodium thionitroprusside complex.
Na2​S+Na2​[Fe(CN)5​NO]⟶Na4​[Fe(CN)5​NOS]
Hence, the correct option  (C) .purple

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