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Write oxidation number of oxygen in KO(3...

Write oxidation number of oxygen in `KO_(3)andNa_(2)O_(2)`.

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`KO_(3)rArr1(K)+3(O)=0`
`therefore1(+1)+3(O)=0`
`thereforeO=-1/3`
`Na_(2)O_(2)rArr2(Na)+2(O)=0`
`therefore2(+1)+2(O)=0`
`therefore2+2(O)=0`
`thereforeO=-1`
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