In the confirmatory test for the sulphide ion (), passing gas through an alkaline solution of sodium nitroprusside results in a purple coloration. What is the coordination complex responsible for this

Question

In the confirmatory test for the sulphide ion ($S^{2-}$), passing $H_2S$ gas through an alkaline solution of sodium nitroprusside results in a purple coloration. What is the coordination complex responsible for this color?

Prashant Kotian · Accepted Answer

Correct answer: B. Sodium nitroprusside is . When it reacts with a sulphide ion (), the nucleophilic sulphide attacks the nitrosyl () ligand. The coordination sphere changes, incorporating the sulphur to form the thionitrosyl complex . The sodium salt of this complex, , exhibits a deep purple or violet color.

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