Fe(CN)6 3- || Paramagnetic || Magnetic property of coordination complex ||

Magnetic property of coordination complex like Fe(CN)6 3- can be predicted by three steps
Step 1 - Write O.N of Central metal ion
Step-2 - Write electronic configuration
Step-3 Identify type of ligand.
According to VBT, the metal atom or ion under the influence of ligands, it uses its orbital to undergo hybridisationThese hybridised orbital overlap with ligand orbital and form bonding.
Iron here is in +3 state
Ite electronic configuration [Ar]3d5
These electrons paired under the influence of strong ligand like CN.
The remaining empty two orbitals ,one s orbital and three p orbitals intermix and form d2sp3 hybridisation which receive pair of electrons from CN group for bond formation.
Molecular geometry= octahedral
Magnetic property= diamagnetic
spin= low spin complex
Since inner 3d orbitals are involved, this complex is inner orbital complex