In the reacion ,
`3Br_(2)+6CO_(3)^(2-)+3H_(2)Orarr5Br^(-)+BrO_(3)^(-)+6HCO_(3)^(-)`

Options

A. Bromine is reduced and carbonate ion is oxidised.
B. Bromine undergoes disproportionation.
C. Bromine is reduced and water is oxidised.
D. Only water is oxidised to carbonic acid.

Answer

B

Explanation

`3Br_(2)+6CO_(3)^(2-)+3H_(2)Orarr 5 Br^(-)+BrO_(3)^(-)+6HCO_(3)^(-)`
Here `Br_(2)` is both reduced and oxidised.
`Br_(2)(0)rarr Br^(-)(-1)` (reduction)
`Br_(2)(0) rarr BrO_(3)^(-) (+5)` ( oxidation)