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Which of the following is paramagnetic?
A
$NO^+$
B
CO
C
$O_2^-$
D
$CN^-$
Detailed Solution
$O_2^-$ has 17 electrons, with one unpaired electron in an antibonding $\pi^*$ molecular orbital, so it is paramagnetic.
$NO^+$, CO and $CN^-$ each have 14 electrons, all paired.
$NO^+$, CO and $CN^-$ each have 14 electrons, all paired.