An aqueous solution of a 3d transition metal ion M ³⁺ (atomic number of M < 26 ) has a spin-only magnetic moment of 4.90 BM. Predict the redox nature of M ³⁺ in aqueous solution and the spin-only magnetic moment of the stable ion formed after its redox reaction.

Step-by-step solution

The spin-only magnetic moment is given by = n(n+2) BM. Given = 4.90 BM, the number of unpaired electrons n = 4 . For a 3d transition metal ion M ³⁺ with Z Mn ³⁺ acts as a strong oxidising agent because it readily accepts an electron to form Mn ²⁺ , which has a highly stable half-filled d^5 configuration. The stable product formed is Mn ²⁺ ( 3d^5 ), which has 5 unpaired electrons. The spin-only magnetic moment of Mn ²⁺ is = 5(5+2) = 35 5.92 BM. Thus, M ³⁺ is an oxidising agent and the magnetic moment of the stable p