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 HNO3 while testing for halogens. By doing so it
Held on 30 Apr 2011 · Verified 9 Jul 2026.
helps in the precipitation of AgCl
increases the solubility product of AgCl
increases the concentration of NO3−ions
decomposes Na2 S and NaCN, if formed
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Markovnikov's rule is applicable to:
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