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Write the oxidation number of oxygen in ...

Write the oxidation number of oxygen in (a) `O_(3)`, (b) MgO, (c) `H_(2)O_(2)`, (D) `KO_(2)` and (e) `OF_(2)`

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Oxidation number of .O. in `O_(3)=0`
Oxidation number of .O. in `MgO=-2`
Oxidation number of .O. in `H_(2)O_(2)=-1`
Oxidation number of .O. in `KO_(2)=-1//2`
Oxidation number of .O. in `OF_(2)=+2`.
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