Predict which of the following will be coloured in aqueous solution?Ti – InterviewSolution

1.	Predict which of the following will be coloured in aqueous solution?Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and CO2+ and MnO4-. Give reasons for each.
Answer» Any ion that has partially filled d-orbitals is coloured due to d-d transition in visible light. Ti³⁺(d¹),V³⁺(d²) Mn²⁺(d⁵),Co²⁺(d⁸) are coloured. MnO^4- has purpule colour due to charge-transfer. Cu⁺(d¹⁰) and Sc³⁺(d⁰) are white since there is no d-d transition.

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