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CuSO4.5H2O is blue in colour while CuSO4 is colourless. Why?
Cuso4.5h20 is blue in colour because its oxidation state is +2 thus it has unpaired electrons in it .so d-d transistion is possible so it exhibits colour where in the other complex d-d transistion is not possible thats why it colourless
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it is due to the water absorbed by it , it appears blue in colour
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In case first complex d-d transition is possible but in second complex d-d transition is not possible thats why second complex has no colour
this is becoz cu+2 ions r blue in color
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