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Which of the following statement(s) is/a...

Which of the following statement(s) is/are correct with respect to bromide ions ?

A

`KBr` on heating with `MnO_(2)` and concentrated `H_(2)SO_(4)` liberates `Br_(2)` and `SO_(2)` gases

B

`KBr` on heating with concentrated `H_(2)SO_(4)` liberates `Br_(2)` and `SO_(@)` gases

C

`KBr` forms `HBr` with concentrated `H_(3)PO_(4)`

D

`KBr(s)` liberates `Br_(2)` on gentle warming with concentrated `H_(2)SO_(4)` and `K_(2)Cr_(2)O_(7)(s)`.

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The correct Answer is:
A, D
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