1.

Out of [Sc(H_(2)O)_(6)]^(3+) and [Ti(H_(2)O)_(6)]^(3+)ions whichiscolouredand why? Give reason.

Answer»

SOLUTION :`[Ti(H_(2)O)_(6)]^(3+)` is coloured while `[Sc(H_(2)O)_(6)]^(3+)` is colourless.This is because `Ti^(3+)`has ONE electron in the d-orbital `( 3d^(1))` which can absorb energy corresponding to yellow wavelength and undergo d-d transition (from `t_(2g)` to `e_(g))`. BU`Sc^(3+)` is `3d^(0)`,i.E., it has no electron in 3d subshell.


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