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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 and AlO2-

c

KO2 only

d

BaO2 only

answer is C.

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Detailed Solution

In NO2+ odd (unpaired) electron is removed. In peroxides O22- no unpaired electrons are present as the antiboinding pi M.O.'s acquired one more electron each for pairing. AlO2- no unpiared electrons. Superoxide O2- has one un paired electron in pi antibonding M.O.
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Among KO2,AlO2-,BaO2 and NO2+, unpaired electron is present in