(C) $H_2S_2O_8$ is known as peroxydisulfuric acid. Its structure contains a peroxide linkage $(-O-O-)$. The oxidation state of $H$ is $+1$,oxygen in p

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(C) $H_2S_2O_8$ is known as peroxydisulfuric acid. Its structure contains a peroxide linkage $(-O-O-)$. The oxidation state of $H$ is $+1$,oxygen in peroxide linkage is $-1$,and other oxygen atoms are $-2$. Let the oxidation number of $S$ be $x$. $2(+1) + 2(x) + 6(-2) + 2(-1) = 0$ $2 + 2x - 12 - 2 = 0$ $2x - 12 = 0$ $2x = 12$ $x = +6$.