Sodium extract is heated with concentrated HNO_(3) before testing for – InterviewSolution

1.	Sodium extract is heated with concentrated HNO_(3) before testing for halogens because :
Answer» Ag reacts faster with halides in ACIDIC medium. Silver halides are totally INSOLUBLE in nitric acid. `Ag_(2)S` and AgCN are SOLUBLE in acidic medium. `S(2-) " and" CN^(-)`, if PRESENT, are decomposed by conc. `HNO_(3)` and hence do not interfere in the test. Answer :D

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