Among $TiF^{2-}_6 ,CoF^{3-}_6 ,Cu_2Cl_2$ and $NiCl^{2-}_4$ the colourless species  are 

  • A

    $CoF^{3-}_6$  and $NiCl^{2-}_4$

  • B

    $TiF^{2-}_6$ and $CoF^{3-}_6$

  • C

    $NiCl^{2-}_4$ and $Cu_2Cl_2$

  • D

    $TiF^{2-}_6$ and $Cu_2Cl_2$

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