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

In the reaction
$3 \mathrm{Br}_{2}+6 \mathrm{CO}_{3}^{2-}+3 \mathrm{H}_{2} \mathrm{O} \longrightarrow 5 \mathrm{Br}^{-}+\mathrm{BrO}_{3}^{-}+6 \mathrm{HCO}_{3}^{-}$
  1. bromine is oxidised and carbonate is reduced.
  2. bromine is reduced and water is oxidised
  3. bromine is neither reduced nor oxidised
  4. bromine is both reduced and oxidised

Solution

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

Asked in: JEE-TOPICTESTS-CHEMISTRY

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