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Predict which of the following will be c...

Predict which of the following will be coloured in aqueous solution? Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and Co2+. Give reasons for each.

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Only those ions will be coloured. Which have in completely filled d-orbitals. Those with fully filled or empty d-orbitals are colourless. Hence, `pi^(3+) , V^(3+) , Mn^(3+)` and `CO^(2+)` are coloured. `MnO_4^Theta ` is also coloured due to charge transfer, only `Sc^(3+) (3d^0) ` is colourless.
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