JEE Main · 2014 · 06 Apr 2014 · Offline · p-Block Elements

Which one of the following properties is not shown by NO?

(A)It combines with oxygen to form nitrogen dioxide
(B)It's bond order is 2.5
(C)It is diamagnetic in gaseous state✓ Correct
(D)It is a neutral oxide

Answer: (C)

Solution

Nitric oxide,

NO

, has an odd number of electrons: one sits alone in an antibonding

π^{*}

orbital, which makes the gaseous molecule paramagnetic, not diamagnetic. That same configuration gives a bond order of

2.5

, and

NO

does combine with oxygen to give

NO X_{2}

while behaving as a neutral oxide. The one property it does not show is being diamagnetic.

JEE Main · 2014 · 06 Apr 2014 · Offline · Single correct option

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