Q.

Which of the following molecular species has unpaired electrons (s) ?

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a

N2

b

F2

c

O2-

d

O22-

answer is C.

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Detailed Solution

In O2- total electrons are 17σ1s2σ*1s2, σ2s2σ*2s2, σ2px2, π2py2, π2pz2, π*2py2, π*2pz1 Hence,  O2- has unpaired electron.
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Which of the following molecular species has unpaired electrons (s) ?