JEE Advanced 2010 Chemistry question

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule is

(A)1 and diamagneticCorrect
(B)0 and diamagnetic
(C)1 and paramagnetic
(D)0 and paramagnetic

Answer: (A)

Solution

has 10 electrons. For B, C and N the energy order is . Normally (obeying Hund's rule) the last two electrons occupy , making paramagnetic. If Hund's rule is violated, both electrons pair up

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Question ID VK-025823