What is the co-ordination number of metal in [Fe(C2O4)3]3− ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Six
Each oxalate ion, \( \ce{C2O4^2-} \), is a bidentate ligand, so the three of them give 3 × 2 = 6 donor atoms.
Why the other options are incorrect
Option (1) Two — Incorrect. This is the number of donor atoms of one oxalate ion, not of the complex.
Option (2) Three — Incorrect. This is the number of ligands; each of them occupies two positions.
NCERT (2026-27 edition):
Coordination Number
