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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 ?

Text Solution

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In hydrated copper solution, `H_(2)O` molecules act as ligands and as a result, crystal field splitting takes place. This leads to `d-d` transition responsible for blue colour of the crystals. In the anhydrous state (`CuSO_(4))`, no such splitting is possible and therefore, the salt is colourless.
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