Cuprous ion is colourless while cupric ion is coloured because

  • A

    Both have half filled $p $ and $d-$ orbitals

  • B

    Cuprous ion has incomplete $d-$ orbital and cupric ion has a complete $d-$ orbital

  • C

    Both have unpaired electrons in the $d-$ orbitals

  • D

    Cuprous ion has a complete $ d-$ orbital and cupric ion has an incomplete $ d-$ orbital

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