The difference in the number of unpaired electrons between and is: — Coordination Compounds Chemistry Question

💡 Solution & Explanation

In both complexes, the central metal is $Co^{3+}$ ($3d^6$). Both ammonia and oxalate act as strong field ligands for $Co^{3+}$, forcing electron pairing. Thus, both are diamagnetic $d^2sp^3$ complexes with 0 unpaired electrons. The difference is 0.