The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so It:

Increases the concentration of NO₃^- ions

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Decomposes Na₂S and NaCN, if formed

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Helps in the precipitation of AgCl

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Increases the solubility product of AgCl

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Solution

The correct option is B
Decomposes Na₂S and NaCN, if formed

$N a_{2} S$ and $N a C N$ are decomposed on heating with $H N O_{3}$ to form $H_{2} S$ and $H C N$ in gaseous phase otherwise they will give precipitate with $A g N O_{3}$
$N a C N + H N O_{3} ⟶ N a N O_{3} + H C N ↑$
$N a_{2} S + 2 H N O_{3} ⟶ 2 N a N O_{3} + H_{2} S$

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