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Why hydrated copper sulphate is blue whi...

Why hydrated copper sulphate is blue while anhydrous copper sulphate is white?

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In hydrated copper sulphate , four water molecules are present as ligands. In the presence of these ligands d-orbitals are no longer degenerate in energy. Hence, d-d transition takes place absorbing red wavelength. The complementary colour, viz, blue is reflected . In anhydrous`CuSO_(4)`, d-orbitals remain degenerate.Hence,no d-d transition can occur. The white light is completely reflectedback. Hence, it looks white.
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