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  4. Which of the following species is paramagnetic ?

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Q. Which of the following species is paramagnetic ?

AIPMTAIPMT 1995Chemical Bonding and Molecular Structure

Solution:

The molecular orbital configuration of $NO$ is
$ KK (\sigma 2s )^2 (\overset{*}{\sigma} 2s)^2 (\sigma 2 p_x)^2 (\pi 2 p_y)^2 (\pi 2 p_z )^2 (\overset{*}{\pi} 2 p_y )^1 $
So, $NO$ is paramagnetic because it contains one unpaired electron.