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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 , `NO_(2)` exists as a monomer which has one unpaired electron but in solid state, It dimerises to `N_(2)O_(4)` so no unpaired electron left. Therefore , `NO_(2)` is paramagnetic in gaseous state but diamagnetic in solid state.
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