Which one of the following is paramagnetic? i) O3 ii) N2 iii) CO iv) O2

The paramagnetic nature of O2 is due to unpaired electrons.  The atomic orbitals of the O atoms overlap to form the σ and π orbitals of the O2 molecule as per the molecular orbital theory. Therefore, oxygen has two unpaired electrons and is paramagnetic. Paramagnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are paramagnetic

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