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Q.

Which of the following is paramagnetic?

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a

B2

b

C2

c

N2

d

F2

answer is A.

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Detailed Solution

Paramagnetic species has unpaired electron.B2=5+5=10σ1s2,σ∗1s2,σ2s2,σ∗2s2,π2px1=π2py1C2=6+6=12=σ1s2,σ∗1s2,σ2s2,σ∗2s2,π2px2=π2py2N2=7+7=14=σ1s2,∗1s2σ2s2,σ∗2s2π2px2=π2py2,σ2pz2F2=9+9=18=σ1s2,σ∗1s2,σ2s2,σ∗2s2,σ2pz2,π2px2=π2py2,π∗2px2=π∗2py2∴ B2 is paramagnetic because it has unpaired electron.
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