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Q.

The configuration 

Question Image

violates
A) Hund's rule
B) Pauli exclusion principle
C) Aufbau principle

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a

A only

b

A and B only

c

A and C only

d

No violation in A, B and C is observed

answer is A.

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Detailed Solution

In degenerate orbitals, all the unpaired electrons must have parallel spin so as to acquire more stability due to higher exchange energy.

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