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Question

Oxygen molecule is paramagnetic because:

A
no. of bonding electrons > no. of antibonding electrons
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B
no. of bonding electrons < no. of antibonding electrons
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C
no. of bonding electrons = no. of antibonding electrons
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D
presence of unpaired electrons in molecular orbitals.
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Solution

The correct option is B presence of unpaired electrons in molecular orbitals.
Electronic configuration of O2:
(σ1s2)(σ1s2)(σ2s2)(σ2s2)(σ2p2z)(π2p2x=π2p2y)(π2p1x=π2p1y),
(π2p1x=π2p1y) each has one electron or unpaired electron.
So the correct option is [D].

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