NEET 2011 Chemistry question

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description ?

(1), - Both diamagnetic
(2), - Both paramagnetic
(3), - Both paramagneticCorrect
(4), - Both paramagnetic

Answer: (3)

Solution

Use molecular orbital theory: a species is paramagnetic if it has unpaired electrons in its MOs. (16 e): , 2 unpaired electrons: paramagnetic. (15 e): one electron removed from a orbital, 1 unpaired electron:

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Question ID VK-090678