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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 is D.
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Detailed Solution
It is a disproportionation reaction, and hence, Br2 is both reduced and oxidised Oxidation state of Br is decreases from 0 to -1 and increases from 0 to +5