A)
B)
C)
D)
Correct Answer: C
Solution :
In option [c], Aufbau principle is violated. According to this rule, the orbital with lower value of n, i.e., 25 will be filled first completely. In option [a] Hunds rule of maximum multiplicity is violated. According to this rule, the pairing of electrons in orbitals of a subshell does not take place until! all the orbitals of a subshell are singly occupied.
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