what is the oxidation state of K in KO2
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It has only one electron in its valence shell and can only take the +1 oxidation state. Now, in KO2, let oxidation number of oxygen be x. Therefore, 1+2x=0 as K=+1 and KO2 is a neutral molecule. The oxidation number of oxygen in KO2 is -1/2.
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In kO2 oxidation state of each oxygen is -1/2.
let oxidation state of k in KO2 be x
=> x+2(-1/2)=0
=> x=+1
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