Consider that a d6 metal ion M2+ forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90BM. The geometry and the crystal field stabilization energy of the complex is?

The metal ion  M2+ with d6 configuration with aqua ligands will have t2g4eg2 in octahedral field and eg3t2g3 in tetrahedral. Then crystal field stabilization energy in octahedral field will be −0.4×4+0.6×2+PΔ0 and in tetrahedral field−0.6×3+(0.4×3)+PΔt. The tetrahedral value is −0.6Δt+p; the value match with 3