1.

Among TiF_(6)^(2-) , CoF_(6)^(3-), Cu_(2)Cl_(2) and NiCl_(4)^(2-) (At, No Ti=22, Co =27, Cu =29, Ni=28) The colourless species are

Answer»

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

Solution :Oxidation state of
`"Ti in "TiF_(6)^(2-)=+4" i.e., "Ti^(4+)rarr3d^(0)`
`"Co in "CoF_(6)^(3-)=+3" i.e., "Co^(3+) RARR 3D^(6)`
`"Ni in "NiCl_(4)^(2-)=+2" i.e., "Ni^(2+)rarr3d^(8)`
`"CU in "Cu_(2)Cl_(2)=+1" i.e., "Cu^(+)rarr3d^(10)`
Colour of salts is a property of party filled d - orbitals. Since `TiF_(6)^(2-)` has completely empty d - subshell and `Cu_(2)Cl_(2)` involves completely filled d - subshell, hence these are COLOURLESS salts.


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