Oxidation number of potassium in $K_2O$,$K_2O_2$ and $KO_2$,respectively,is
- A$+1, +4$ and $+2$
- B$+1, +2$ and $+4$
- C$+1, +1$ and $+1$
- D$+2, +1$ and $+\frac{1}{2}$
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