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During halogen test, sodium fusion extract is boiled with concentrated HNO 3 to

Options

  1. Aremove unreacted sodium
  2. Bdecompose cyanide or sulphide of sodium
  3. Cextract halogen from organic compound
  4. Dmaintain the pH of extract.

Correct answer

B. decompose cyanide or sulphide of sodium

Step-by-step solution

The sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne's test. These ions would otherwise interfere with silver nitrate test for halogens.

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