JEE Mains · Chemistry · STD 11 - 8.3. Organic chemistry purification and characterization
The Lassiagne's extract is boiled with dil \(\mathrm{HNO}_3\) before testing for halogens because,
- A \(\mathrm{AgCN}\) is soluble in \(\mathrm{HNO}_3\)
- B Silver halides are soluble in \(\mathrm{HNO}_3\)
- C \(\mathrm{Ag}_2 \mathrm{~S}\) is soluble in \(\mathrm{HNO}_3\)
- D \(\mathrm{Na}_2 \mathrm{~S}\) and \(\mathrm{NaCN}\) are decomposed by \(\mathrm{HNO}_3\)
Answer & Solution
Correct Answer
(D) \(\mathrm{Na}_2 \mathrm{~S}\) and \(\mathrm{NaCN}\) are decomposed by \(\mathrm{HNO}_3\)
Step-by-step Solution
Detailed 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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