Paramagnetic behaviour is observed in ________ out of $O_{3}, O_{2}, N O$ and $N O_{2}$ :

O_{3}

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O_{2}

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N O

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N O_{2}

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Solution

The correct options are
A $O_{2}$
C $N O$
D $N O_{2}$
Simply by counting their electron if it is even then it is diamagnetic if it is odd then paramagnetic.
But here $O_{2}$ is exception it is paramagnetic.
$O_{3}$ :3*8=24 electrons: diamagnetic
$N O$ : 7+8=15: paramagnetic
$N O_{2}$ :7+2x8=23: paramagnetic
Hence options B,C & D are correct.

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