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Oxygen is usually assigned an oxidation state of ‒2 in its covalent compounds, such as CO, CO2, SO2, and SO3. Exceptions to this rule include peroxides (compounds containing the O2-2 group), where each oxygen is assigned an oxidation state of ‒1, as in hydrogen peroxide (H2O2), and OF2 in which oxygen is assigned a +2 oxidation state. You can check to see the oxidation states of oxygen by drawing out the Lewis Structure and calculating formal charge.
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