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Question

Which of the following violates Hund's Rule?

A
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B
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C
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D
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Solution

The correct option is C
Hund's Rule states that pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital has got one electron each i.e., it is singly occupied.
Also, all of the unpaired electrons have parallel spin to attain maximum multiplicity.

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