In the reaction
`3Br_(2) + 6CO_(3)^(2-) + 3H_(2)O to 5Br^(-) + 2BrO_(3)^(-)+6HCO_(3)^(-)`

Options

A. bromine is oxidsied and the carbonate radical is reduced
B. bromine is reduced and the carbonate radical is oxidised
C. bromine is neither reduced nor oxidised
D. bromine is both reduced and oxidised

Answer

D

Explanation

`3overset(0)(Br_(2)) + 6CO_(3)^(2-) + 3H_(2) O to 5 overset(-1)(Br) + overset(+5)(Br) O_(3)^(-) + 6HCO_(3)^(-)`
`Br_(2)` is reduced to `Br^(-)` (oxidation number decreases from zero to -1) and `Br_(2)` is oxidised to `BrO_(3)^(-)` (oxidation number increases from zero to `+5`).