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Question:

Which of the following is paramagnetic?

O2

NO+

B2

CO

Solution:

Diamagnetic- all the even electron dimolecule is diamagnetic. except (10 16) Paramagnetic-all the odd electron molecule is paramagnetic B2(10)= paramagnetic CO(14)= diamagnetic O2(16)= diamagnetic NO+(14)= diamagnetic.