Question

Out of $TiF_6^{2-}$, $CoF_6^{3-}$, Cu₂Cl₂ and $NiCl_4^{2-}$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:
(a) Cu₂Cl₂ and $NiCl_4^{2-}$
(b) $TiF_6^{2-}$, 6 and Cu₂Cl₂
(c) $CoF_6^{3-}$ and $NiCl_4^{2-}$
(d) $TiF_6^{2-}$, 6 and $CoF_6^{3-}$

Answer 1

the answer to this questions is

A