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Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?

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Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?
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In gaseous state NO2 exists as monomer which has one unpaired electron but in solid state it dimerises to N2O4 so no unpaired electron is left hence solid form is diamagnetic.

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