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As stated in the answer above, note that oxygen does not always have its expected oxidation state of -2! Although that is what it is the majority of the time, there are exception cases that occur significantly frequently.
The oxidation state of oxygen in its compounds is usually -2, except for peroxides like H2O2, and Na2O2, in which the oxidation state for O is -1. The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1.
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