1.

Out of TiF_6^(2-), Cu_2Cl_2, NiCl_4^(2-) and CoF_6^(3-) (Z of Ti=22 , Co=27 , Cu=29, Ni=28) the colourless species are

Answer»

`CoF_6^(3-)` and `NiCl_4^(2-)`
`TiF_6^(2-)` and `Cu_2Cl_2`
`Cu_2Cl_2` and `NiCl_4^(2-)`
`TiF_6^(2-)` and `CoF_6^(3-)`

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