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$Among {KO}_{2}, {AlO}_{2}^{-}, {BaO}_{2}, and {NO}_{2}^{+} one unpaired$ electron is present in

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O2+and BaO2

KO2 and AlO2−

KO2 only

BaO2 only

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Correct option is C

KO2 has K+O2−structure having on unpaired electron.

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Among KO2,AlO2−,BaO2, and NO2+one unpaired electron is present in

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$Among {KO}_{2}, {AlO}_{2}^{-}, {BaO}_{2}, and {NO}_{2}^{+} one unpaired$ electron is present in