Reaction of Br_2 with Na_2CO_3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO_2 gas. The number of sodium bromide molecules involved in the balanced chemical equation is

JEE Advanced 2011 Chemistry question

Reaction of with in aqueous solution gives sodium bromide and sodium bromate with evolution of gas. The number of sodium bromide molecules involved in the balanced chemical equation is

Answer: 5

Solution

Bromine disproportionates: (0) is reduced to (−1), a gain of 1 electron per Br, and oxidised to (+5), a loss of 5 electrons per Br. Balancing electrons, 5 Br atoms become for

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Question ID VK-025892