Question

In the complex ion  Fe(C₂O₄)₃  the Co-ordination number of Fe is

• A. 5
• B. 6
• C. 3
• D. 4

Hint:

Remember that the coordination number is the number of bonds formed between the metal and ligands. For bidentate ligands like oxalate, each ligand contributes two bonds.

Answer 1

The Correct Option is B

In the complex ion \( [Fe(C_2O_4)_3]^{3-} \), the oxalate ions (\( C_2O_4^{2-} \)) are bidentate ligands, meaning each oxalate ligand forms two bonds with the central metal ion. Since there are three oxalate ions, they contribute 6 bonding sites to the central Fe ion, making the coordination number of Fe equal to 6. Thus, the correct answer is: \[ \text{(2) 6} \]