1.

Which of the following groups contain coloured ionsout of Cu^(2+), Ti^(4+), Co^(2+) and Fe^(2+)?

Answer»

Only `Cu^(2+), TI^(4+)`
`Cu^(2+), Co^(2+), Fe^(2+)`
`Ti^(4+), Co^(2+)`
All of these

Solution :Colour of a compound is property of unpaired d - electrons.
`{:("Ion","Electronic","Unpaired"),(,"configuration","ELECTRON"),(Cu^(2+),3d^(9),1),(Ti^(4+),3d^(0),0),(Co^(2+),3d^(7),3),(Fe^(2+),3d^(6),4):}`
Since `Cu^(2+),Co^(2+) and Fe^(2+)` contains unpaired electrons these are COLOURED ions.


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