Sodium extract is heated with con. HNO(3...

Sodium extract is heated with con. `HNO_(3)` before testing for halogens because

`Ag_(2)S and AgCN` are soluble in acidic medium.

Silver halides are totally insoluble in nitric acid.

`S^(2-) and CN^(-)`, if present, are decomposed by conc. `HNO_(3)` and hence do not interfere in the test.

Ag reacts faster with halides in acidic medium

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Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elementsline N,S,P andhalogensaredetected by their usual tests. Q. The lassaigne's extract is boiled with dil. HNO_3 before testing for halogens because

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