Reaction of $B r_{2}$ with $N a_{2} C O_{3}$ in aqueous solution gives sodium bromide and sodium bromate with evolution of $C O_{2}$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is ___

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Solution

$B r_{2}$ is disproportionated in basic medium as $3 B r_{2} + 3 N a_{2} C O_{3} \to 5 N a B r + N a B r O_{3} + 3 C O_{2}$

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