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

During halogen test, sodium fusion extract is boiled with concentrated HNO3 to
  1. remove unreacted sodium
  2. decompose cyanide or sulphide of sodium
  3. extract halogen from organic compound
  4. maintain the pH of extract.

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.

Asked in: JEE Main 2022 (25 Jun Shift 2)

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