Pair of ions which gives blue colour in aqueous state :

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

  • A

    $V^{+4},\, Cu^{+2}$

  • B

    $Co^{+2}, \,Ni^{+2}$

  • C

    $Fe^{+3},\, Ti^{+3}$

  • D

    $Cr^{+3}, \,Zn^{+2}$

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Reason : The reactants are most strongly adsorbed on group $7-9 $ elements.

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