JEE Advanced Chemistry question

The number of unpaired electrons expected for the complex ion

(A)2
(B)3
(C)4Correct
(D)5

Answer: (C)

Solution

is , so is . is a strong-field ligand; applying crystal field theory with the available electrons, the configuration becomes (strong field favours filling before pairing is avoided in , but with only 4 electrons and 3 orbitals,

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Question ID VK-160086