What is the number of unpaired electrons in [Co(NH_3)_6]^ 3+ complex?

MHT CET 2025 Chemistry question

What is the number of unpaired electrons in complex?

(A)4
(B)3
(C)2
(D)ZeroCorrect

Answer: (D)

Solution

In the oxidation state of Co is +3 (the ligand is neutral), so Co is . is a strong-field ligand, so the crystal-field splitting exceeds the pairing energy and the six d electrons pair up in the lower set:

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Question ID VK-102835