In test of NO3^- ion, the dark brown ring complex is formed, which is true of this complex? — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: Recall that the Ni^2+ ion has a 3d^8 electronic configuration. Step 2: In an octahedral field (whether with weak-field H2O or moderately strong-field NH3 ligands), a d^8 ion must always have the t_2g^6 e_g^2 configuration. Step 3: This configuration leaves exactly 2 unpaired electrons in both complexes, meaning the spin-only magnetic moment remains unchanged at 2.83 BM.