Which anion produce violate coloration when react with sodium pentacynidonitrosoniumferrate(II)

Question

TestHub · Accepted Answer

Sodium pentacyanonitrosylferrate(II), commonly called Sodium Nitroprusside, is used to detect sulphide ions (S²⁻).

When S²⁻ reacts with sodium nitroprusside in alkaline medium, a violet/purple coloration is produced.

NO₂⁻, NO₃⁻, and CN⁻ do not give this characteristic violet color.

Therefore, the test is specific for sulphide ions.

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