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  4. Lassigne's test is used in qualitative analysis to detect

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Q. Lassigne's test is used in qualitative analysis to detect

NTA AbhyasNTA Abhyas 2022

Solution:

Nitrogen, sulphur and halogens are tested in an organic compound by Lassaigne's test.
The organic compound is fused with sodium metal as to convert these elements into ionisable inorganic substances,
$Na+C+N \rightarrow NaCN$
$2Na+S \rightarrow Na_{2}S$
$2Na+X_{2} \rightarrow 2NaX$
The cyanide, sulphide or halide ions can be confirmed in aqueous solution by usual test.