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The coordination number of Fe in [Fe(C₂O₄)₃]³⁻ is
A{'text': '6', 'label': 'A'}
B{'text': '4', 'label': 'B'}
C{'text': '5', 'label': 'C'}
D{'text': '3', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '6', 'label': 'A'}
1. Oxalate (C₂O₄²⁻) is a bidentate ligand.
2. Three oxalate ligands provide 3 × 2 = 6 donor atoms.
3. The coordination number counts the number of ligand donor atoms bonded to the metal.
4. So Fe has coordination number 6, not 3.
_Source: NCERT Class 12 Chemistry, Unit 5 "Coordination Compounds", §5.2(d)_
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