Oxidation number(s) of potassium in K2O,...

Oxidation number(s) of potassium in `K_2O`, `K_2O_2` and `KO_2`, respectively, is(are)

A

+1,+1 and +1

B

+2, +1 and `1/2`

C

+1, +2 and +4

D

+1, +4 and +2

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