Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
Question
Explain, why Lassaigne's solution is boiled with conc. $\mathrm{HNO}_3$ before testing for halogens?
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Answer
It is done so as to decompose NaCN to HCN and $\mathrm{Na}_2 \mathrm{S}$ to $\mathrm{H}_2 \mathrm{S}$ which are removed as gases otherwise they will interfere with the tests for halogens.
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