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Q.

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

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a

NO2+ and BaO2

b

KO2 only 
 

c

KO2 and AlO2–

d

BaO2 only 
 

answer is C.

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Detailed Solution

Potassium superoxide KO2 only contains unpaired electrons. 

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