Question

Coordination number of Ni in [Ni(C₂O₄)3]⁴⁻ is ______.

Options

• 3

• 6

• 4

• 5

Answer 1

Coordination number of Ni in [Ni(C₂O₄)3]⁴⁻ is 6.

Explanation:

Oxalate [Ni(C₂O₄)3]⁴⁻ is a bidentate ligand, meaning it coordinates to the metal through two donor atoms.

Since there are three oxalate ligands, and each oxalate binds through two donor atoms, the total coordination number is 6 (3 ligands × 2 donor atoms per ligand).

Thus, the coordination number of Ni in this complex is 6.