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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Chemistry
Chapter
Redox Reactions

BITSAT 2012 · Chemistry · Redox Reactions

In the reaction 3 Br_ 2 +6 CO_ 3 ^ 2- +3 H_ 2 O arrow 5 Br^ - +BrO_...

In the reaction 3Br2+6CO32−+3H2O→5Br−+BrO3−+6HCO3−3 \mathrm{Br}_{2}+6 \mathrm{CO}_{3}^{2-}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 5 \mathrm{Br}^{-}+\mathrm{BrO}_{3}^{-}+6 \mathrm{HCO}_{3}^{-}

Options

  1. ABromine is oxidised and carbonate is reduced.
  2. BBromine is reduced and water is oxidised.
  3. CBromine is neither reduced nor oxidised.
  4. DBromine is both reduced and oxidised.

Correct answer

D. Bromine is both reduced and oxidised.

Step-by-step solution

3Br2+6CO32−+3H2O→5Br−+BrO3−+6HCO3−\begin{aligned} 3 \mathrm{Br}_{2}+6 \mathrm{CO}_{3}^{2-}+3 \mathrm{H}_{2} \mathrm{O} & \rightarrow \\ 5 \mathrm{Br}^{-} &+\mathrm{BrO}_{3}^{-}+6 \mathrm{HCO}_{3}^{-} \end{aligned} O.N. of Br2\mathrm{Br}_{2} changes from 0 to -1 and +5 , hence it is reduced as well as oxidised.
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