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[Ti(H2O)6]^3 is coloured while [Sc(H2O)6]^3 is colourless. Explain.

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[Ti(H2O)6]3 is coloured while [Sc(H2O)6]3 is colourless. Explain.

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Ti [Ti(H2O)6]3 is in +3 oxidation state and

Sc in [Sc(H2O)6]3 is in +3 oxidation state.

The outer electronic configuration of Sc, Ti and the corresponding trivalent ions are

Sc21 : 3d1 4s2    Sc3+ : 3d0

Ti22 : 3d1 4s2    Ti3+ : 3d1

Since there is no electron in 3d orbitals of Sc d-d transition is not possible hence [Sc(H2O)6]3+ is colourless. But Ti3+ in [Ti(H2O)6]3+ has one electron in 3d orbitals hence d-d transition is possible hence it is coloured.

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