NEET Chemistry: Magnetic Properties questions with solutions

Q1. Nitric oxide is paramagnetic in :

1. gaseous state.
2. liquid state
3. solid state
4. polymeric state

Answer: gaseous state.

Nitric oxide (NO) has 11 valence electrons, so in the gaseous state it contains one unpaired electron and is paramagnetic. In condensed or polymeric forms, pairing/interactions can remove this behavior.