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Which of the following groups contain co...

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

A

Only `Cu^(2+), Ti^(4+)`

B

`Cu^(2+), Co^(2+), Fe^(2+)`

C

`Ti^(4+), Co^(2+)`

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
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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