A sample of chloroform, before using as an anaesthetic, is tested ______.

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A sample of chloroform, before using as an anaesthetic, is tested after boiling with alc. KOH, with silver nitrate. Explanation: Chloroform is tested after boiling with alcoholic KOH and then adding silver nitrate. • Boiling with alc. KOH breaks chloroform into chloride ions (Cl−). • Adding AgNO3 gives a white precipitate of AgCl, confirming the presence of chloroform.

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