In the balanced reaction, 

${\text{IO}}_3^{-}+{\text{SO}}_2+4{\text{H}}_{\text{2}}\text{O}\to {\text{I}}_2+{\text{SO}}_4^{-2}+8{\text{H}}^{+}$ the  coefficient of ${\text{SO}}_{\text{2}}$is 

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