Cuprous ion is colourless, while cupric ion is coloured because

  • A

    Both have unpaired electrons in $d$-orbital

  • B

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

  • C

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

  • D

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

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