Question:
Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?
Solution:
Nitric acid in the gaseous state exists in monomer form. It consists of only one unpaired electron therefore it is paramagnetic. In solid-state, it exists as a dimer (N2O2).
There is no unpaired electron in its dimer form, therefore it is diamagnetic.
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