1.

[Ti(H_(2)O)_(6)]^(2+) is purple in colour. Prove this statement

Answer»

Solution :`(i)` In `[Ti(H_(2)O)_(6)]^(2+)`, the central metal ion is `Ti^(3+)` which has `d^(1)` configuration. This single electron occupies one of the `t_(2g)` orbitals in the octahedral aqua ligand field.
`(II)` When WHITE light falls on this complex, the d electron absorbs light and promotes itself to eg level.
`(iii)` The spectral data show the absorption maximum is at `20000cm^(-1)` corresponding to the crystal field splitting energy `(Delta_(0))239.7kJ mol^(-1)`. The transmitted colour ASSOCIATED with this absorption is PURPLE and hence the complex appears in purple in colour.


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