66.
[Ti(H2O)6]3+ is coloured while [Sc(H2O)6]3+ is colourless. Explain.
Ti has the electronic configuration [Ar] 3d2. In [Ti(H2O)6]3+ complex it is present as Ti3+ which has one unpaired electron in 3d orbital.Thus d-d transition is possible only in Ti(H2O)63+ and thereby it shows colour And also it undergoes d2sp3 (octahedral) hybridization to accomodate 6 pairs of water.
So the complex is octahedral in shape, will be coloured and paramagnetic due to presence of one unpaired electron.
Sc has the electronic configuration [Ar]3d1 . Since it is present in the complex [Sc(H2O)6]3+ as Sc3+ it has no unpaired electron. It will also undergo d2sp3 hybridization to accomodate 6 pairs of electrons from water.
So it is also octahedral, colourless and diamagnetic due to absence of unpaired electron.
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