Question

In the following reaction,
$3B{r}_2+6C{O}_3^{2-}+3H_{2}O\to 5B{r}^{-}+Br{O}_3^{-}+6HC{O}_3^{-}$

• A. Bromine is oxidised, carbonate is reduced
• B. Bromine is reduced, carbonate is oxidised
• C. Bromine is neither reduced nor oxidised
• D. Bromine is reduced as well as oxidised

Answer 1

The correct option is D Bromine is reduced as well as oxidised

In the given reaction,
$3\stackrel{0}{B}{r}_2+6\stackrel{+4}{C}{O}_3^{2-}+3H_{2}O\to 5\stackrel{-1}{B}{r}^{-}+\stackrel{+5}{B}r{O}_3^{-}+6H\stackrel{+4}{C}{O}_3^{-}$
As can be seen from the oxidation state, bromine is reduced as well as oxidised because it's oxidation state changes from $0$ to $-1$ and $+5$.