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

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Brown colour

Purple colour

Red colour

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.
Na₂S+Na₂[Fe(CN)₅NO]⟶Na₄[Fe(CN)₅NOS]
Hence, the correct option (C) .purple

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