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Question

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


Your Answer
A
Both will be attracted, but to the opposite poles
Your Answer
B
Both will be attracted, but to the same poles
Your Answer
C
Liquid O2 will be attracted, but liquid N2 will be unaffected
Correct Answer
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 repelled
In O2 molecule, the antibonding π2px and π2py 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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