Chemical Bonding and Molecular Structure - Result Question 89
####91. Which of the following is paramagnetic?
(a) $O_2$
(b) $N_2$
(c) $H_2$
(d) $Li_2$
[NEET Odisha 2019]
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Solution:
- (a) Molecular orbital configuration of $O_2$ is given as :
$ \begin{aligned} & O_2(16 e^{-}): \sigma 1 s^{2} \sigma * 1 s^{2} \sigma 2 s^{2} \sigma * 2 s^{2} \sigma 2 p_z^{2} \\ & \pi 2 p_x^{2}=\pi 2 p_y^{2} \pi * 2 p_x^{1}=\pi * 2 p_y^{1} \end{aligned} $
So, in $O_2$ molecule, there are two (2) unpaired electrons, so, it is a “paramagnetic” substance in nature.
