Eamcet - Chemistry - D F Block Elements

Cuprous ion is colourless while cupric ion is coloured because :

A.  both have unpaired electrons in the'd' orbital

B.  cuprous ion has completed d-orbital and cupric ion has incomplete d-orbital

C.  both have half-filled p and d orbitals.

D.  cuprous ion has incompleted d-orbitals and cupric ion has a completed d-orbital

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