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[Ti (H2O)6]^(3+) is coloured while [Sc(H...

`[Ti (H_2O)_6]^(3+)` is coloured while `[Sc(H_2O)_6]^(3+)` is colourless. Explain.

Text Solution

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In `[Sc(H_2O)_6]^(3+)` electronic configuration of `Sc^(3+)` ion is `3 d^0` while in `[Ti(H_2O)_6]^(3+)` electronic configuration of `Ti^(+)`ions, is `3d^1`. Hence with `3d^0` configuration, no d-d transition are possible in `Sc^(3+)` ion, hence it is colourless. On the other hand, with one unpaired 3d- electron in `Ti^(3+)` ion, d-ditransition are possible and hence it is coloured :
`Sc^(3+) : [Ar]3d^0`
`Ti^(3+) : [Ar]3d^1`
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Knowledge Check

  • Which is colourless in water (H_2O) ?

    A
    `Ti^(3+)`
    B
    `V^(3+)`
    C
    `Cr^(3+)`
    D
    `Sc^(3+)`

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