1.

[Ti(H_(2)O)_(6)]^(3+) is coloured while [Sc(H_(2)O)_(6)]^(3+) is colourless. Why ?

Answer»

Solution :In `[Ti(H_(2)O)_(6)]^(3+), Ti^(3+)` ion has one electron in the d-subshell (lower energy `t_(2g)` d-ORBITALS, has the configuration `t_(2g)^(1)e_(g)^(0)`) which can absorb light in the VISIBLE region RESULTING into d-d transition (jump into higher energy `e_(g)` orbitals). As a result, green and YELLOW portions of light are absorbed. The complex has the complementary colour, viz, purple. In `[Sc(H_(2)O)_(6)]^(3+)`, `Sc^(3+)` has no d-electron. Hence, no light is absorbed for d-d transition. Hence, it is colourless.


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