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