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Predict which of the following will be coloured aqueous solution?

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Predict which of the following will be coloured aqueous solution?

Ti3+, V3+ cu+, Sc3+, Mn2+, Fe3+ and CO2+ and MnO4- . Give reasons for each.

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Any ion that has partially filled d-orbitals is coloured due to d-d transition in visible light. MnO 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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