The Lassiagne's extract is boiled with dil HNO 3 before testing for halogens because,

Na 2 S and NaCN are decomposed by HNO 3

Silver halides are soluble in HNO 3

Chemistry · Practical Organic Chemistry

JEE Main 2024 — 30 January, Shift 1 — Question 66

The Lassiagne's extract is boiled with dil $\mathrm{HNO}_{3}$ before testing for halogens because,

Option A:
AgCN is soluble in $\mathrm{HNO}_{3}$
Option B:
Silver halides are soluble in $\mathrm{HNO}_{3}$
Option C:
$\mathrm{Ag}_{2} \mathrm{~S}$ is soluble in $\mathrm{HNO}_{3}$
Option D:
$\mathrm{Na}_{2} \mathrm{~S}$ and NaCN are decomposed by $\mathrm{HNO}_{3}$
Correct

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

Answer key and solution verified before publishing.

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