In the prepartion of `HBr` or `HI, NaX (X=Br,I)`   is treated with `H_(3)PO_(4)` and not by
Channel: Doubtnut
Date: 2020-04-12

In the prepartion of `HBr` or `HI, NaX (X=Br,I)`   is treated with `H_(3)PO_(4)` and not by concentrated `H_(2)SO_(4)` since,