When testing for halogens using Lassaigne's extract, the extract is first boiled with concentrated nitric acid () before adding silver nitrate. The reason for this step is to:

Question

When testing for halogens using Lassaigne's extract, the extract is first boiled with concentrated nitric acid ($HNO_3$) before adding silver nitrate. The reason for this step is to:

Prashant Kotian · Accepted Answer

Correct answer: B. If nitrogen or sulphur are present, the cyanide and sulphide ions will form white and black precipitates, interfering with the halogen test. Boiling with expels them as volatile and gases.

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