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why anohydrous salt of Cu2+ are colorless while it has 3d9 electron. there is possibility of allowed d-d transition

why anohydrous salt of Cu2+ are colorless while it has 3d9 electron. there is possibility of allowed d-d transition
 

Grade:12th pass

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
6 years ago
actually the hydrous copper salt CuSO4.5H2O has a blue colour,when it is heated there is a removal of 5 mole of electron and it changes ti anhydrous form which makes it colourless.actually there is no d-d transition simply there is removal of 5 moles of water from the hydrated copper ion

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