The Lassaigne's extract is boiled with dilute | vedclass

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Question

(D) In the Lassaigne's test,if the organic compound contains nitrogen or sulphur,the sodium fusion extract will contain $NaCN$ or $Na_2S$ respectively

Vedclass · Accepted Answer

$Na_2S$ and $NaCN$ are decomposed by $HNO_3$

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(D) In the Lassaigne's test,if the organic compound contains nitrogen or sulphur,the sodium fusion extract will contain $NaCN$ or $Na_2S$ respectively. These ions interfere with the silver nitrate test for halogens by forming precipitates like $AgCN$ or $Ag_2S$. Boiling the extract with dilute $HNO_3$ decomposes these species into volatile gases ($HCN$ and $H_2S$),thereby removing them from the solution before the addition of $AgNO_3$.

The Lassaigne's extract is boiled with dilute $HNO_3$ before testing for halogens because,

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