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Question

Among KO2,AlO−2,BaO2,andNO+2, unpaired electron is present in:

A
KO2 and BaO2 both
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B
neither KO2 nor BaO2
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C
KO2 only
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D
BaO2 only
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Solution

The correct option is B KO2 only
Superoxide (KO2) is paramagnetic. It contains O+2 ion. The electronic configuration of the O+2 containing 15 electrons can be written as:

1s21s22s22s22pz22px22py22px1.

It has one unpaired electron.

BaO2 has O+22 ion. The electronic configuration of the O+22 containing 14 electrons can be written as:

1s21s22s22s22pz22px22py2.

It is diamagnetic as it has 0 unpaired electrons.


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