1.

Out of TiF_(6)^(2-),CoF_(6)^(3-) , Cu_(2)Cl_(2) and NiCl_(4)^(2-)(ZofTi =22, Co=27 , Cu =29 , Ni = 28), the colourless species are

Answer»

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

Solution :`Cu_(2)Cl_(2)(Cu^(+)= 3d^(10)),TiF_(6)^(2-)(Ti^(4+)= 3d^(0))`


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