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Among 'KO2, AlO2^-, BaO2' and 'NO2^+', u...

Among 'KO_2, AlO_2^-, BaO_2' and 'NO_2^+', unpaired electron is present in :

A

NO_2^+' and 'BaO_2'

B

KO_2' and 'AlO_2^-'

C

KO_2' only

D

BaO_2' only

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The correct Answer is:
A
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