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  4. Reaction of Br 2 with Na 2 CO 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

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Q. Reaction of $Br _{2}$ with $Na _{2} CO _{3}$ 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 AdvancedJEE Advanced 2011

Solution:

$3 Br _{2}+3 Na _{2} CO _{3} \longrightarrow 5 NaBr + NaBrO _{3}+3 CO _{2}$
So, number of NaBr molecules $=5$