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NEET2011ChemistryGeneral Organic ChemistryActual

The Lassaigne's extract is boiled with conc HNO ₃ while testing for halogens. By doing so it

Options

  1. Ahelps in the precipitation of AgCl
  2. Bincreases the solubility product of AgCl
  3. Cincreases the concentration of NO ₃⁻ ions
  4. Ddecomposes Na ₂ ~S and NaCN , if formed

Correct answer

D. decomposes Na ₂ ~S and NaCN , if formed

Step-by-step solution

Na ₂ ~S and NaCN, if present in the extract, will be decomposed to H ₂ ~S and HCN by HNO ₃ . aligned & NaCN + HNO ₃ NaNO ₃+ HCN & Na ₂ ~S +2 HNO ₃ 2 NaNO ₃+ H ₂ ~S aligned These will escape from the solution and will not interfere with the test for halogens.

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