Na2 S and NaCN, if present in the extract, will be decomposed to H2 S and HCN by HNO3. NaCN+HNO3⟶NaNO3+HCNNa2 S+2HNO3⟶2NaNO3+H2 S These will escape from the solution and will not interfere with the test for halogens.
The Lassaigne's extract is boiled with conc HNO_3 while testing for halogens. By doing so it
NEET UG 2011 — Chemistry Organic Chemistry
2011mcqmedium
The Lassaigne's extract is boiled with conc HNO3 while testing for halogens. By doing so it
Official previous-year question
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Options
- A
helps in the precipitation of AgCl
- B
increases the solubility product of AgCl
- C
increases the concentration of NO3−ions
- D
decomposes Na2 S and NaCN, if formed
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