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NEET levelSingle correct optionDifficulty 1 of 3pn022

Which oxide of nitrogen is a colourless, paramagnetic gas?

A $N X_{2} O$
B $N X_{2} O X_{5}$
C $NO$
D $NO X_{2}$

Answer: C

NO

has an odd number of electrons (11 valence electrons), so it is paramagnetic, and it is a colourless gas.

NO X_{2}

is also paramagnetic but brown;

N X_{2} O

and

N X_{2} O X_{5}

have even electron counts and are diamagnetic.

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