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In the reaction 3Br2 + 6CO3^2- + 3H2O → 5Br^- + BrO3^- + 6HCO3^- (a) bromine is oxidised and carbonate is reduced.

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In the reaction

3Br2 + 6CO32- + 3H2O → 5Br- + BrO3- + 6HCO3-

(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

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Correct answer: (d) bromine is both reduced and oxidised

Explanation:

3Br2 + 6CO32- + 3H2O → 5Br- + BrO3- + 6HCO3-

O.N. of Br2 changes from 0 to -1 and +5 hence it is reduced as well as oxidised.

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