The d-orbitals involved in sp^3d^2 or d^2sp^3 hybridisation of the central metal ion are : — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: In [Co(NH3)6]Cl3, the cobalt is Co^3+, which has a 3d^6 configuration. Step 2: NH3 is a strong-field ligand that forces pairing, giving a low-spin t_2g^6 e_g^0 configuration. Step 3: The CFSE is calculated as: 6 * (-0.4 Δ_o) + 0 * (0.6 Δ_o) = -2.4 Δ_o, matching option (c).