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Question

Among KO2,Na2O and BaO2 unpaired electron(s) is/are present in:


A

NO2+ and BaO2

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B

KO2 and AlO2-1

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C

KO2 only

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D

BaO2 only

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Solution

The correct option is C

KO2 only


This essentially boils down to the differences in the magnetic nature of the normal oxide O2, the peroxide O22 and the superoxide O2 ions. Among these - the oxide and the peroxide do not contain unpaired electrons whereas the superoxide is paramagnetic (it has an unpaired electron).


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