Which of the following ions will exhibit colour in aqueous solutions?

  • [AIPMT 2010]
  • A

    $La^{3+}\, (Z = 57)$

  • B

    $Ti^{3+} \,(Z = 22)$

  • C

    $Lu^{3+} \,(Z = 71)$

  • D

    $Sc^{3+} \,(Z = 21)$

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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]

Pair of ions which gives blue colour in aqueous state :

$V^{+4},\,Ni^{+2},\, Ti^{+3}, \,Co^{+2}, \,Fe^{+3}, \,Cu^{+2}$