Oxidation state of oxygen in peroxides

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Janiceleong26
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Homework Statement


The oxidation state of oxygen in all compounds is -2, except in peroxides such as H2O2, Na2O2 and BaO2 where it is -1. If it is -1, then why can't we write H2O2 and Na2O2 as HO and NaO respectively?
 
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BvU said:
Basically because they are different molecules. The O-O presence is essential.
I see thanks