Multiple choice Which of the following sets contains colourless aquated transition metal ions only? Sc3+, Ti3+, Zn2+ Sc3+, Ti4+, Cu2+ Sc3+, Ti4+, Zn2+ Ti3+, V4+, Zn2+ Reveal answer Fill a bubble to check yourself C Correct answer Explanation Sc3+: 3d0, No unpaired electrons-colourless Ti4+: 3d0, No unpaired electrons-colourless Zn2+: 3d10, No unpaired electrons-colourless