The d-And-f-Block Elements

Short Answer Type

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Why is copper sulphate pentahydrate coloured?

 

In copper sulphate pentahydrate (CuSO4.5H2O) copper is divalent (Cu2+). Copper(II) have the configuration
1s2 2s2 2p6 3s2 3p6 3d9
An ion or compound is coloured when it has unpaired electron in its d-orbitals. Cu(II) has one unpaired electron in its d-orbital, hence it is coloured.

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