1.

Which of the following compounds is coloured

Answer»

`TiCl_(3)`
`FeCl_(3)`
`CoCl_(2)`
All of these

Solution :The compounds having METAL ions with unpaired electrons, are coloured. THUS, in `TiCl_(3)`
`Ti^(3+) = [Ar]3d^(1) (` one unpaired electron ) in `FeCl_(3)`
`Fe^(3+)= [Ar]3d^(5) (` Fiveunpaired electrons)in `CoCl_(2)`
`Co^(2+) = [Ar]3d^(7)` ( Three unpaired electrons )
Hence, all compoundsare coloured.


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