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Why is NO(2) paramagnetic in gaseous sta...

Why is `NO_(2)` paramagnetic in gaseous state but the solid obtained on cooling is diamagnetic?

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In gaseous state,` NO_(2)`, exists as a monomer which has one unpaired electron hence, it is paramagnetic. But in solid state, it dimerises to `N_(2) O_(4)`, so no unpaired electron left. Hence, it is diamagnetic in solid state.
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