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MDCAT Chemistry QUESTION #7797
Question 1

The blue colour of \(\mathrm{Cu}^{2+}\) salt solutions is due to:

  • d-d orbital transition✔️
  • p-d transition
  • p-p transition
  • s-p transition
Correct Answer Explanation

Cu²⁺ (d⁹) in water absorbs orange/red light (d-d transition), transmitting blue. d-d transitions are responsible for colors of many transition metal complexes.