Question:

Coordination number of Fe in \([Fe(C_2O_4)_3]^{3-}\) is :

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In coordination complexes, the coordination number is determined by the number of bonds formed between the central metal ion and its ligands.
Updated On: Jun 25, 2025
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The Correct Option is C

Solution and Explanation

The coordination number of a central metal atom in a coordination compound refers to the number of ligand donor atoms bonded directly to the metal. In the compound [Fe(C2O4)3]3-, the ligand oxalate (C2O4) is bidentate, meaning it can form two bonds with the metal atom. Since there are three oxalate ligands, each contributing two donor atoms bound to the iron (Fe), the total coordination number for Fe is calculated as follows:
Ligand TypeNumber of LigandsDonor Atoms Per LigandTotal Donor Atoms
Oxalate (C2O4)323 × 2 = 6
Hence, coordination number of Fe in [Fe(C2O4)3]3- is 6.
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