Lassaigne`s solution is boiled with conc. $H N O_{3}$ before testing for halogens because

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$A g_{2} S$ is soluble in $H N O_{3}$

Silver halides are insoluble in $H N O_{3}$

$A g C N$ is soluble in $H N O_{3}$

$N a_{2} S$ and $N a C N$ are decomposed by $H N O_{3}$

answer is B.

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Detailed Solution

If sulphur or nitrogen is present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne’s test. otherwise these ions will interfere with silver nitrate test and result in other color formation.

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