MHT CET 2022 Chemistry question

Identify the number of unpaired electrons present and the geometry respectively of a complex (given atomic number Co = 27)

(A)4, OctahedralCorrect
(B)2, trigonal bipyramidal
(C)0, Octahedral
(D)0, trigonal bipyramidal

Answer: (A)

Solution

In cobalt is in the +3 state: Co (3d4s) Co = 3d. F is a weak-field ligand and cannot force pairing, so the electrons stay as (high spin) with 4 unpaired electrons; the hybridisation is (outer orbital) and the six

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Question ID VK-095911