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

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

A

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

B

`Ag` reacts faster with halides in acidix medium

C

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

D

silver halides are totally insoluble in nitric acid

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A
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