(C) To find the oxidation state of $S$ in $H_2SO_3$,let the oxidation state of $S$ be $x$.The oxidation state of $H$ is $+1$ and $O$ is $-2$.Applying

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(C) To find the oxidation state of $S$ in $H_2SO_3$,let the oxidation state of $S$ be $x$.The oxidation state of $H$ is $+1$ and $O$ is $-2$.Applying the sum of oxidation states equal to zero:$2(+1) + x + 3(-2) = 0$$2 + x - 6 = 0$$x - 4 = 0$$x = +4$Therefore,the oxidation state of $S$ is $+4$.