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In the complex [Mn(CN)6]3−, O.S. of Mn is +3. The presence of a strong field ligand CN− causes pairing of electrons.

1. 3d5 4s2 4p0
2. 3d4 4s0 4p0
3. 3d6 4s0 4p0
4. 3d3 4s0 4p0

Correct answer: 3d3 4s0 4p0

Solution

In [Mn(CN)6]3−, Mn has an oxidation state of +3, making its electronic configuration 3d4. CN− is a strong field ligand, causing pairing of electrons in the d-orbitals, resulting in a low-spin configuration of 3d3 4s0 4p0.

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