Consider that a d6 metal ion (M2+) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex is :
(1) tetrahedral and –1.6 Δt + 1P
(2) tetrahedral and –0.6 Δtp
(3) octahedral and –1.6 Δ0
(4) octahedral and –2.4 Δ0 + 2P