1.

Riddish brown gas is obtain with the following are treated with cone H_(2)SO_(4)

Answer»

`BR^(Θ)`
`NO_(2)^(Θ)`
`NO_(3)^(Θ)`
`SO_(3)^(2-)`

Solution :`Br^(Theta)` IONS gives `Br_(2),NO_(2)^(Theta)` and `NO_(3)^(Theta)` GIVE `NO_(2)` gaswichare brown in colour


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