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Q. Bromine water reacts with $SO_2$ to form ?

AFMCAFMC 2010The p-Block Elements - Part2

Solution:

When bromine water reacts with $SO _{2}$, it oxidises it to sulphuric acid and itself gets reduced to $HBr$.
$\underbrace{ Br _{2}+2 H _{2} O }+ SO _{2} \longrightarrow 2 HBr + H _{2} SO _{4}$