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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
Question
Explain, why Lassaigne's solution is boiled with conc. HNO3 before testing for halogens?
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Answer

It is done so as to decompose NaCN to HCN and Na2S to H2S which are removed as gases otherwise they will interfere with the tests for halogens.

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