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