What is the difference between the coordination number and the number of counter ions in [Fe(H₂O)6]Cl₃?
Coordination number = 6 (6 H₂O), counter ions = 3 (3 Cl−). Difference = 6 − 3 = 3.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance