In the qualitative test for sulphur, the addition of sodium nitroprusside to the Lassaigne's extract — Practical Organic Chemistry and Purification Chemistry Question
Question
In the qualitative test for sulphur, the addition of sodium nitroprusside to the Lassaigne's extract yields a deep violet color due to the formation of:
Answer: A
💡 Solution & Explanation
The sulphide ion reacts with sodium nitroprusside to form the highly colored complex sodium thionitroprusside, $Na_4[Fe(CN)_5NOS]$.
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