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The lassaigne’s extract is boiled with Con. $H N O_{3}$ before testing for halogens because

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

$N a C N + H N O_{3} \to N a N O_{3} + H C N ↑$

$C N^{-}$ and $S^{2 -}$ ions interfere with $A g N O_{3}$ test for halogens

answer is D.

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In order to decompose unreacted sulphide and cyanide, $H N O_{3}$ is added

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