Amongst  $Ti{F_6}^{2 - }\,,\,Co{F_6}^{3 - }\,,\,C{u_2}C{l_2}$ and $NiCl_4^{2-}$ the colourless species are 

  • A

    $Co{F_6}^{3 -}$ and $NiCl_4^{2-}$

  • B

    $Ti{F_6}^{2 - }$ and $Co{F_6}^{3 -}$

  • C

    $C{u_2}C{l_2}$ and  $NiCl_4^{2-}$

  • D

    $Ti{F_6}^{2 - }$ and $C{u_2}C{l_2}$

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