Based on concepts from both crystal field theory and valence bond theory,the most likely combination of molecular orbital,magnetic and geometric descriptions for the [Fe(H₂O)₆]²⁺ ion is ________. A)sp²^d/diamagnetic/square planar B)sp²^d/paramagnetic/square planar C)sp³^d²/diamagnetic/octahedral D)sp³^d²/paramagnetic/octahedral E)sp²^d/paramagnetic/tetrahedral

Question

Quizplus · Accepted Answer

The presence of both strong-field (S) and weak-field (O) ligands in the coordination sphere of Fe suggests that the complex will be octahedral in shape. Since there are unpaired electrons in the complex, it will be paramagnetic. The molecular orbital diagram for the complex shows that there are two unpaired electrons in the d orbitals of Fe, which leads to paramagnetism. Therefore, the correct combination of molecular orbital, magnetic and geometric descriptions for the [Fe(H₂O)₆]²⁺ ion is sp³^d²/paramagnetic/octahedral.

Based on Concepts from Both Crystal Field Theory and Valence