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CuSO(4).5H(2)O is blue in colour while C...

`CuSO_(4).5H_(2)O` is blue in colour while `CuSO_(4)` is colourless. Why ?

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In `CuSO_(4).5 H_(2)O, 4 H_(2)O` molecules are present as ligand. Crystal field splitting occurs and hence d-d transition occurs which gives it blue colour. In `CuSO_(4)`, there are no `H_(2)O` molecules present as ligand. No crystal field splitting occurs and hence it has no colour.
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