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Question

Among KO2,AlO−2,BaO2 and NO+2, unpaired electron is present in -

A
NO+2,BaO2
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B
KO2 and AlO2
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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
KO2 is paramagnetic due to presence of unpaired electron in O2 (Super oxide)

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