The Lassaigne's extract is boiled with conc. | vedclass

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(A) If $Na_2S$ and $NaCN$ are present in the extract,they will interfere with the test for halogens by forming precipitates with $AgNO_3$.Boiling the

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decomposes $Na_2S$ and $NaCN$ formed

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(A) If $Na_2S$ and $NaCN$ are present in the extract,they will interfere with the test for halogens by forming precipitates with $AgNO_3$.Boiling the extract with conc. $HNO_3$ decomposes these compounds into volatile $H_2S$ and $HCN$ gases:$NaCN + HNO_3 \rightarrow NaNO_3 + HCN \uparrow$$Na_2S + 2HNO_3 \rightarrow 2NaNO_3 + H_2S \uparrow$These gases escape from the solution,ensuring they do not interfere with the halogen test.

The Lassaigne's extract is boiled with conc. $HNO_3$ while testing for halogens. By doing so it

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