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Account for the following: Salts of Cupric (Cu2+) ion are coloured whereas salts of the Cuprous (Cu+) ion are colourless. - Chemistry (Theory)

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Question

Account for the following:

Salts of Cupric (Cu2+) ion are coloured whereas salts of the Cuprous (Cu+) ion are colourless.

Short Note

Solution

Salts of Cupric (Cu2+) ions are coloured, whereas salts of cuprous (Cu+) ions are colourless. This is due to the fact that the cupric ion has an incomplete d-orbital, whereas the cuprous ion has a complete one. Cuprous ions contain exactly half-filled d-orbitals, making d-d transitions impossible between them.

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Ionic Equilibria - Salt Hydrolysis
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