Colour of transition metal compounds

2009 AIPMT 1 question

1. 1 The d- and f-Block Elements
   Out of $TiF_6^{2-}$, $CoF_6^{3-}$, $Cu_2Cl_2$ and $NiCl_4^{2-}$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are
   A $CoF_6^{3-}$ and $NiCl_4^{2-}$ B $TiF_6^{2-}$ and $CoF_6^{3-}$ C $Cu_2Cl_2$ and $NiCl_4^{2-}$ D $TiF_6^{2-}$ and $Cu_2Cl_2$
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