(C) In a superoxide ion $(O_2^-)$,the total charge on the ion is $-1$. Let the oxidation number of oxygen be $x$. Since there are two oxygen atoms,the

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(C) In a superoxide ion $(O_2^-)$,the total charge on the ion is $-1$. Let the oxidation number of oxygen be $x$. Since there are two oxygen atoms,the sum of their oxidation numbers must equal the charge of the ion: $2x = -1$ $x = -\frac{1}{2}$ Therefore,the oxidation number of oxygen in superoxide is $-\frac{1}{2}$.