In case of peroxides and superoxides, oxidation number of oxygen respectively are

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-12 and -1

-1 and -12

+12 and -12

+1 and -1

answer is B.

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Detailed Solution

In peroxides (such as H2O2, Na2O2), each oxygen atom is assigned an oxidation number of -1 and in superoxides (such as KO2, RbO2), it is -12

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