During the test of halogens by silver ni...

During the test of halogens by silver nitrate test, the sodium extract is first boiled with a few drops of conc. `HNO_3` to

Decompose sodium halides present

Help in the precipitation of `AgCl`

Increase the concentration of `NO_(3)^(-)` ions

Decompose `Na_2S` and `NaCN` if formed

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