JEE Main 10 April 2016 Paper

Section: Chemistry

Question : 51 of 90

Marks: +1, -0

Sodium extract is heated with concentrated HNO3 before testing for halogens because :

[Main 10 Apr 2016]

Silver halides are totally insoluble in nitric acid.
Ag2S and AgCN are soluble in acidic medium.
S2− and CN−, if present, are decomposed by conc. HNO3 and hence do not interfere in the test.
Ag reacts faster with halides in acidicmedium.

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