The Lassaigne's extract is boiled with conc. HNO _3 while testing for halogens. By doing so it :

NEET 2011 Chemistry question

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

(1)decomposes and NaCN, if formed.Correct
(2)helps in the precipitation of AgCl.
(3)increases the solubility product of AgCl.
(4)increases the concentration of ions.

Answer: (1)

Solution

The sodium fusion extract may contain and if nitrogen and sulphur are present. These would also give precipitates with (AgS and AgCN) and interfere with the halide test. Boiling with conc. destroys them:

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Question ID VK-090802