All of the following complexes will be colored (in the visible)EXCEPT ____. A) [Co(en)₃]²⁺ B) [Fe(CN)₆]^4- C) [Ni(H₂O)₆]²⁺ D) [Sc(NH₃)₆]³⁺ E) [Cu(NH₃)₄]²⁺

Question

Quizplus · Accepted Answer

Scandium exists in the +3 oxidation state, which does not allow for any d-orbital electrons to be present, resulting in no visible color. Therefore, [Sc(NH3)6]3+ is colorless. The other complexes have transition metal ions in higher oxidation states with d-orbital electrons present, allowing for visible colors to be observed.

All of the Following Complexes Will Be Colored (In the Visible)EXCEPT