JEE MAIN - Chemistry (2024 - 30th January Morning Shift - No. 11)
The Lassiagne's extract is boiled with dil $$\mathrm{HNO}_3$$ before testing for halogens because,
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 $$\mathrm{HNO}_3$$.
Explanation
If nitrogen or sulphur is also present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium during Lassaigne's test
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