In the Lassaigne's test for sulphur, the sodium fusion extract undergoes specific reactions. Which o — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

Sulphur forms $Na_2S$ during sodium fusion. When reacted with sodium nitroprusside, it forms a deep violet complex called sodium thionitroprusside, $Na_4[Fe(CN)_5NOS]$. Alternatively, adding acetic acid and lead acetate forms a black precipitate of Lead sulphide ($PbS$).