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Amongst TiF6^(2-), CoF6^(3-), Cu2Cl2" an...

Amongst `TiF_6^(2-), CoF_6^(3-), Cu_2Cl_2" and " NiCl_4^(2-)`, which are the colourless species ? (atomic number of Ti = 22 , Co = 27, Cu = 29, Ni = 28)

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The correct Answer is:
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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