Question

In the reaction $3 Br _{2}+6 CO _{3}^{2-}+3 H _{2} O \longrightarrow 5 Br ^{-}+ BrO _{3}^{-}+6 HCO _{3}^{-}$

• A. Bromine is oxidised and carbonate is reduced.
• B. Bromine is reduced and water is oxidised.
• C. Bromine is neither reduced nor oxidised.
• D. Bromine is both reduced and oxidised.

Answer 1

Answer: (D)

Bromine is both reduced and oxidised.

Answer 2

$3 Br _{2}+6 CO _{3}^{2-}+3 H _{2} O \longrightarrow 5 Br ^{-}+ BrO _{3}^{-}+6 HCO _{3}^{-}$
O.N. of $Br _{2}$ changes from 0 to $-1$ and $+5$, hence it is reduced as well as oxidised.