(B) Let the oxidation number of $O$ be $X$. In $H_2O_2$,the oxidation number of $H$ is $+1$. Applying the rule for the sum of oxidation numbers in a n

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(B) Let the oxidation number of $O$ be $X$. In $H_2O_2$,the oxidation number of $H$ is $+1$. Applying the rule for the sum of oxidation numbers in a neutral molecule: $2(+1) + 2(X) = 0$ $2 + 2X = 0$ $2X = -2$ $X = -1$ Therefore,the oxidation number of $O$ in $H_2O_2$ is $-1$.