Question

# Liquid oxygen and liquid nitrogen are allowed to flow between the poles of an electromagnet. Choose the correct observation:

A
Both will be attracted, but to the opposite poles
B
Both will be attracted, but to the same poles
C
Liquid O2 will be attracted, but liquid N2 will be unaffected
D
Liquid O2 will be attracted, but liquid N2 will be repelled

Solution

## The correct option is D Liquid O2 will be attracted, but liquid N2 will be repelledIn O2 molecule, the antibonding π∗2px and π∗2py orbitals are singly occupied and hence it is paramagnetic in nature and is attracted to the electromagnet. Whereas in N2, the σ 2pz is fully occupied and hence N2 is diamagnetic and is repelled by the electromagnet.

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