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Sulphur

Freshly prepa...

Question

Freshly prepared solution of sodium nitroprusside is added to the sodium extract. Appearence of a deep violet colour indicated the presence of:

A

nitrogen

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B

sulphur

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C

both nitrogen and sulphur

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D

halogen

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Solution

The correct option is B sulphur
Appearance of deep violet colour is due to the formation of sodium penta-cyano nitrosyl thiol ferrate(VI) which indicates the presence of sulphur.
${N a}_{2} S + {N a}_{2} [F e {(C N)}_{5} N O] ⟶ {N a}_{4} [F e {(C N)}_{5} N O S] deep violet color$

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