Oxidation number of potassium in ` K _ 2 O`, ` K_2 O _ 2 and K O _ 2 ` , respectively, is :

Oxidation number of potassium in ` K _ 2 O`, ` K_2 O _ 2 and K O _ 2 ` , respectively, is :
A. ` + 1 ,+2 and + 4 `
B. ` + 1, + 1 and +1 `
C. `+1,+4 and +2`
D. ` + 2, + 1 and + ( 1 ) /(2) `

Oxidation number of potassium in ` K _ 2 O`, ` K_2 O _ 2 and K O _ 2 ` , respectively, is :

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