1.

Identify the complexes which are expected to be coloured

Answer»

`[Ti(NO_(3))_(4)]`
`[Cu(NC CH_(3))_(4)]^(+)BF_(4)^(-)`
`[Cr(NH_(3))_(6)]^(3+)3Cl^(-)`
`K_(3)[VF_(6)]`

Solution :Only those complexes are COLOURED in which the central metal ion has incompletely filled d-subshell.
`{:("Complex","Central ion","Outer metal ion configuration","Colour"),(Ti(NO_(3))_(4),Ti^(4+),3d^(0)4S^(0),"colourless"),([Cu(NC CH_(3))_(4)]^(+)BF_(4)^(-),Cu^(+),3d^(10)4s^(0),"colourless"),([Cr(NH_(3))_(6)]^(3+)3Cl^(-),Cr^(3+),3d^(3)4s^(0),"coloured"),(K_(3)[VF_(6)],V^(3+),3d^(2)4s^(0),"coloured"):}`


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