1.

A Unknown salt (S) when heated with dil H_(2)SO_(4) does not evolve brown vapours but with conc. H_(2)SO_(4) brown vapours are obtained. The vapours when brought in contact with AgNO_(3) solution do not give any precipitate. The salt (S) contains.

Answer»

`NO_(2)^(-)`<BR>`NO_(3)^(-)`
`I^(-)`
`Br^(-)`

ANSWER :B


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