The Lassiagne's extract is boiled with dil $\mathrm{HNO}_3$ before testing for halogens because,

Question

Silver halides are soluble in $\mathrm{HNO}_3$.

$\mathrm{AgCN}$ is soluble in $\mathrm{HNO}_3$.

$\mathrm{Na}_2 \mathrm{S}$ and $\mathrm{NaCN}$ are decomposed by $\mathrm{HNO}_3$.

$\mathrm{Ag}_2 \mathrm{S}$ is soluble in $\mathrm{HNO}_3$.

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