Same chapter3 marksDifficulty: Medium
Write the IUPAC name of K3[Fe(CN)6] and of [Co(NH3)6]Cl3.
Coordination Compounds
3 marksDifficulty: Medium
What is crystal field splitting, and why is [Co(NH3)6]3+ diamagnetic?
Original Khojo Papers practice question — not from a past board paper.
Answer
In an octahedral field the five d orbitals split into a lower t2g set of three and a higher eg set of two, the energy gap being the crystal field splitting energy. Ammonia is a strong field ligand, so the gap is larger than the pairing energy and all six d electrons of Co3+ pair up in the t2g set, leaving no unpaired electron and making the complex diamagnetic.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
With a weak field ligand such as fluoride the same ion gives a paramagnetic complex.
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