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