The lassaigne's extract is boiled with concentrated ${HNO}_{3}$ before testing for halogens because.

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

AgCN is soluble in $H N O_{3}$

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

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

answer is B.

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Detailed Solution

Na₂S and NaCN may interfere with $A g N O_{3}$ test for halogens. This is the reason that sodium extract is heated with concentrated HNO₃ before testing for halogens because S^2-(Na₂S) and CN- (NaCN) are readily decomposed by conc. HNO₃. Hence, they won't interfere in the test.

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