1.

Among `(A)` `TiF_(6)^(2-),(B) CoF_(6)^(3-), (C ) Cu_(2)CI_(2)` and` (D) NiCI_(4)^(2)` (atomic number of `Ti=22,Co=27,Cu=29,Ni=28)` the colourless species are (a) `(B)` and `(D)` (b) `(A)` and `(B)` `C ` and (D)` `(A)` and `(C )` .

Answer» Correct Answer - d
Completely filled d-orbital system or completely unfilled d-orbital system are colourless Thus colour of a complex is explained on the basis of d-transition
`{:(In,Cu_2Cl_2,Cu,is i n,+1OS),(i.e.,3d^(10),system,and,),(i n,TiF_6^(2-),Ti,is i n,+4OS),(i.e.,3d^(0),system,,):}}"Colourless"` .


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