1.

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

Answer»

`Ti^(3+), V^(3+)`
`Cu^(+), Sc^(3+)`
`Cu^(2+), FE^(2+)`
`Co^(2+), NI^(2+)`

Solution :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.


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