What is the oxidation state of Oxygen in peroxides

April 7, 2026Chemistry

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In peroxides, the oxidation state of Oxygen is $-1$ .

This is because oxygen atoms are bonded to each other (O-O bond), and each oxygen atom gains one electron from the other element it is bonded to, instead of the usual two electrons. For example, in hydrogen peroxide ( $\text{H}_2\text{O}_2$ ), each oxygen atom is bonded to one hydrogen atom and one other oxygen atom.

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