Answer:
(i) Anhydrous 
has no ligand. So, crystal, field splitting
doesn't occur so, it doesn't show any colour but in hydrated form it is linked
with (
) ligand so, it shows colour due to d-d
transition.
(ii) 
is a complex compound. In presence of
molecules the d-orbitals of 
undergo splitting. The compound is
coloured (violet) due to d-d transition. On heating water molecules
escape, d-orbitals become degenerate. There is no d-d transition. Hence compound
becomes colourless.
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