Out of TiF62$-$, CoF63$-$, Cu2Cl2 and NiCl42$-$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are

Question

Out of TiF₆^2$-$, CoF₆^3$-$, Cu₂Cl₂ and NiCl₄^2$-$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are

Cu₂Cl₂ and NiCl₄^2$-$

TiF₆^2$-$ and Cu₂Cl₂

CoF₆^3$-$ and NiCl₄^2$-$

TiF₆^2$-$ and CoF₆^3$-$

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