In which of the following pairs are both the ions coloured in aqueous solution ?

(At. no. : $Sc = 21, Ti = 22, Ni = 28,$$ Cu = 29, Co = 27$)

  • [AIPMT 2006]
  • A

    $Ni^{2+}, Cu^+$

  • B

    $Ni^{2+}, Ti^{3+}$

  • C

    $Sc^{3+}, Ti^{3+}$

  • D

    $Sc^{3+}, Co^{2+}.$

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