All the metal ions contains t2g6 eg0 configurations. Which …

Chemistry Co-ordinatios Compounds General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

All the metal ions contains t2g6 eg0 configurations. Which of the following complex will be paramagnetic?

[FeCl(CN)4(O2)]4-

K4[Fe(CN)6]

[Co(NH3)6]Cl3

[Fe(CN)5(O2)]-5

Text Solution

Verified by Experts

The correct answer is:

[FeCl(CN)4(O2)]4– ; O2 is O22–; CN– is strong field ligand, so compels for the pairing of electrons.

Fe3+ → 3d5 ;

K4[Fe(CN)6] ; CN– is strong field ligand so compels for the pairing of electrons.

Fe2+ → 3d6 :

[Co(NH3)6]Cl3 ; NH3 is strong field ligand and 3d6 configuration has higher CFSE compelling for the pairing of electrons.

Co3+ → 3d6 :

[Fe(CN)5(O2)]5– ; O2 is O22– ; CN– is strong field ligand so compels for the pairing of electrons

Fe2+ → 3d6 :

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