Out of TiF 6 2- and CoF 6 3- , Cu 2Cl 2 and NiCl 4 2- (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are : -

1. A. CoF 6 3- and NiCl 4 2-
2. B. TiF 6 2- and CoF 6 3-
3. C. Cu 2Cl 2 and NiCl 4 2-
4. D. TiF 6 2- and Cu 2Cl 2

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