MHT CET 2022 Chemistry question

How many unpaired electrons are present in cobalt ion in +3 oxidation state prior to hybridization in complex ion?

Answer: (C)

Solution

Co (Z = 27) is , so is . is a weak-field ligand, so pairing of electrons does not occur (high-spin, outer-orbital complex). The arrangement is $

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Question ID VK-095764