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Question

# Which of the following species is/are diamagnetic (I) O+2 (II) O2 (I) O−2 (II) O2−2

A
O2,O+2
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B
O2 and O22
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C
O22 only
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D
O+2,O22
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Solution

## The correct option is C O2−2 onlyO2 (σ1s)2(σ∗1s)2(σ2s)2(σ∗2s)2(σ2pz)2(π2px)2=(π2py)2(π∗2px)1=(π∗2py)1(σ∗2pz)0 O+2 (σ1s)2(σ∗1s)2(σ2s)2(σ∗2s)2(σ2pz)2(π2px)2=(π2py)2(π∗2px)1=(π∗2py)0(σ∗2pz)0 O−2 (σ1s)2(σ∗1s)2(σ2s)2(σ∗2s)2(σ2pz)2(π2px)2=(π2py)2(π∗2px)2=(π∗2py)1(σ∗2pz)0 O−22 (σ1s)2(σ∗1s)2(σ2s)2(σ∗2s)2(σ2pz)2(π2px)2=(π2py)2(π∗2px)2=(π∗2py)2(σ∗2pz)0 Unpaired e−O2=2O+2=1O−2=1O22=0 The species having no unpaired electron is diamagnetic. So, only O2−2 is diamagnetic.

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