Which of the following properties is not shown by NO?
(IIT-JEE, 2014)

It combines with oxygen to form nitrogen dioxide

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It's bond order is 2.5

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It is diamagnetic in gaseous state.

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It is a neutral oxide.

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Solution

The correct option is C It is diamagnetic in gaseous state.
(a), (b) and (d) are correct but (c) is incorrect.

:N = O:

NO is paramagnetic in gaseous state due to the presence of unpaired electron in its structure and is neutral oxide.

Calculation of bond order:
Total number of electrons = 7 + 8 = 15
Remaining p electrons = 15 - 8 = 7
$N_{b}$ = 6, Na = 1.
B.O. = $\frac{1}{2} (6 - 1) = 2.5$

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