The intense, vibrant purple colour of the aqueous permanganate ion () is a heavily tested visual phe — d and f Block Elements Chemistry Question

💡 Solution & Explanation

A $d-d$ transition requires at least one $d$ -electron. Since $Mn^{7+}$ is $d^0$, the intense purple colour arises entirely from Charge Transfer. Visible light excites an electron from the ligand (Oxygen) momentarily into the empty metal $d$ -orbital.