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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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