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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