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Which group contains coloured ions out o...

Which group contains coloured ions out of (1) `Cu^(+2)` (2)`Ti^(+2)` , (3) `Co^(+2)` , (4) `Fe^(+2)`

A

1, 2, 3,4

B

1, 3, 4

C

2, 3, 4

D

1,2,3

Text Solution

Verified by Experts

The correct Answer is:
B
Presence of unpaired `e^-` in (n-1)d orbitals gives colour to compounds.
`Cr^(2+) to [Ar] 4s^0 3d^9`
`Co^(2+) to [Ar] 4s^0 3d^7`
`Fe^(2+) to [Ar] 4s^0 3d^1`
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MARVEL PUBLICATION-D AND F BLOCK ELEMENTS -TEST YOUR GRASP
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