1.

When KBr is treated with conc. H_(2)SO_(4) reddish-brown gas is evolved. The gas is

Answer»

`B_2O_3`
`SO_2`
`O_2`
`SO_3`

SOLUTION :`2B + 3H_(2) SO_(4) rarr 2H_(3) BO_(3) + SO_(2) UARR`


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