Predict which pairs of ions is not coloured in aqueous solutions ?

Question

Predict which pairs of ions is not coloured in aqueous solutions ?

Predict which pairs of ions is not coloured in aqueous solutions ?
A. `Ti^(3+), V^(3+)`
B. `Cu^(+), Sc^(3+)`
C. `Cu^(2+), Fe^(2+)`
D. `Co^(2+), Ni^(2+)`

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - B
Only those ions will be coloured which have incompletely filled d-orbitals.Those with fully-filled or empty d-orbitals are mostly colourless. Thus, `Ti^(3+)(3d^1),V^(3+)(3d^2),Cr^(3+)(3d^3),Cu^(2+)(3d^9), Fe^(3+)(3d^5) and Co^(2+)(3d^7)` are all coloured due to d-d transition. Only `Sc^(3+)(3d^0)` is colourless.