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Which species does not exhibit paramagnetism :
A
$N_2^+$
B
$O_2^-$
C
CO
D
NO
Detailed Solution
Paramagnetism requires unpaired electrons.
$N_2^+$ (13 electrons), $O_2^-$ (17 electrons) and NO (15 electrons) have an odd number of electrons, so each has an unpaired electron and is paramagnetic.
CO has 14 electrons (isoelectronic with $N_2$), all paired in its molecular orbitals, so it is diamagnetic.
So CO does not exhibit paramagnetism.
$N_2^+$ (13 electrons), $O_2^-$ (17 electrons) and NO (15 electrons) have an odd number of electrons, so each has an unpaired electron and is paramagnetic.
CO has 14 electrons (isoelectronic with $N_2$), all paired in its molecular orbitals, so it is diamagnetic.
So CO does not exhibit paramagnetism.