Explain, why Lassaigne's solution is boiled with conc. HNO3 befor… - Vidyadip

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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