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Anhydrous copper sulphate is colourless,...

Anhydrous copper sulphate is colourless, but hydrated copper sulphate is blue. Explain ?

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In anhydrous copper sulphate, the splitting is very less. It absorbs energyin infrared region.It is colourless. In hydrated copper sulphate, water molecules are present in the coordination sphere. The splitting of d-orbitals is reasonably increased. If it absorbs energy in visible region of light.Hence it is exhibit colour.
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