1.

Amongst T_(2)F_(6)^(2-), CoF_(6)^(2-), Cu_(2)Cl_(2) and NiCl_(4)^(2-) [Atomic number of Ti, Co, Ni and Cu are 22,27,28 and 29 respectively), the colourless species are

Answer»

`CoF_(6)^(2-)` and `NiCl_(4)^(2-)`
`TiF_(6)^(2-)` and `CoF_(6)^(3-)`
`Cu_(2)Cl_(2)`and `NiCl_(4)^(2-)`
`TiF_(6)^(2-)` and `Cu_(2)Cl_(2)`

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