Question

The coordination number of the central metal ion in \([ \text{Fe(CN)}_6 ]^{4-}\) is:

• A. 4
• B. 6
• C. 2
• D. 3

Hint:

To determine coordination number, count the number of ligand donor atoms directly attached to the metal center. Monodentate ligands contribute 1 each.

Answer 1

The Correct Option is B

Step 1: Understand the coordination number.
The coordination number is the number of ligand atoms directly bonded to the central metal ion.
Step 2: Analyze the complex \([ \text{Fe(CN)_6 ]^{4-}\).}
Here, Fe is surrounded by 6 cyanide (\( \text{CN}^- \)) ligands. Each CN⁻ is a monodentate ligand (donates one electron pair), so the coordination number is 6.