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Chemistry Question on Chemical bonding and molecular structure

Which one of the following pairs consists of only paramagnetic species?

A

[O2,NO][O_2, NO]

B

[O2+,NO22−][O^{+}_{2}, NO^{2-}_{2}]

C

[CO, NO]

D

[NO,NO+][NO, NO^+]

Answer

[O2,NO][O_2, NO]

Explanation

Solution

According to MOT, 02(16)
s 1s^2, s^* 1s^2, s2s^2, s^* 2s^2, s 2p^2_z \Bigg\\{\, ^{\pi2p^2_x}_{\pi2p^2_y},\Bigg\\{\, ^{\pi^*\, 2p^1_x}_{\pi^*\, 2p^1_y},
Electronic configuration of O2O_2 shows the presence of two unpaired electrons, so it is paramagnetic in nature.
NO (15)
s 1s^2, s^* 1s^2, s2s^2, s^* 2s^2, s 2p^2_z \Bigg\\{\, ^{\pi2p^2_x}_{\pi2p^2_y},\Bigg\\{\, ^{\pi^*\, 2p^1_x}_{\pi^*\, 2p^0_y}
Electronic configuration of NO shows the presence of one
unpaired electron, so it is also paramagnetic in nature.