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JEE Main Chemistry question

ChemistryRedox ReactionsJEE Main

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: (C)

Solution

undergoes disproportionation in basic/carbonate medium: 3Br_2 + 3Na_2CO_3 \to 5NaBr + NaBrO_3 + 3CO_2. Checking atoms confirms this is

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Question ID VK-136678