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Anhydrous CuSO(4) is white while hydrate...

Anhydrous `CuSO_(4)` is white while hydrated `CuSO_(4)` is blue. Why?

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Anhydrous copper sulphate has no ligands while hydrated salt has water as ligand. D-d transition is possible in `CuSO_(4)*5H_(2)O`. So, it is coloured complex.
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