Question bank/JEE Main/Chemistry
JEE MainChemistryToughCoordination Compounds
All the metal ions contain t2g6 eg0 configurations. Which of the
following complex will be paramagnetic?
Show answer and solution
(1) [FeCl(CN)4(O2)]4-; O2 is O22-; CN- is strong field
ligand, so compels for the pairing of electrons.
Fe3+→ 3d5 (2) K4[Fe(CN)6]; CN- is strong field ligand so compels for the
pairing of electrons.
Fe2+→ 3d6 (3) [Co(NH3)6]Cl3; NH3 is strong field ligand and 3d6 configuration
has higher CFSE compelling for the pairing of electrons.
Co3+→ 3d6 (4) [Fe(CN)5(O2)]5-; O2 is O22-; CN- is strong field ligand
so compels for the pairing of electrons
ligand, so compels for the pairing of electrons.
Fe3+→ 3d5 (2) K4[Fe(CN)6]; CN- is strong field ligand so compels for the
pairing of electrons.
Fe2+→ 3d6 (3) [Co(NH3)6]Cl3; NH3 is strong field ligand and 3d6 configuration
has higher CFSE compelling for the pairing of electrons.
Co3+→ 3d6 (4) [Fe(CN)5(O2)]5-; O2 is O22-; CN- is strong field ligand
so compels for the pairing of electrons
Source: Grass-G / CH-15 Chemistry Paper 11 Nov..docx
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