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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn108

Select the correct statement(s) about the oxides of nitrogen.

A $NO$ is paramagnetic
B $NO X_{2}$ is paramagnetic and bent
C $N X_{2} O X_{4}$ is diamagnetic
D $N X_{2} O$ is paramagnetic

Answer: A, B, C

NO and

NO X_{2}

have an odd number of electrons and an unpaired electron, so both are paramagnetic (

NO X_{2}

is bent). Dimerisation of

NO X_{2}

pairs the electrons, so

N X_{2} O X_{4}

is diamagnetic.

N X_{2} O

has an even number of electrons, all paired, and is diamagnetic.

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