GKFix MCQ Question

Why are Sc³⁺ and Zn²⁺ ions typically colorless?

• A. They are always in aqueous solution
• B. They have partially filled d subshells
• C. They absorb all wavelengths of visible light
• D. They have either empty (Sc³⁺) or full (Zn²⁺) d subshells, preventing d-d transitions.