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Question

Predict which of the following will be coloured in aqueous solution? Ti3+,V3+,Cu+,Se3+,Mn2+,Fe3+ and Co2+. Give reasons for each.

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Solution

Only those ions will be coloured which have incomplete d-orbitals. Ions which has complete or vacant d-orbitals are colourless.

Ti3+=[Ar]3d1PurpleV3+=[Ar]3d2GreenCu+=[Ar]3d10ColourlessSc3+=[Ar]3d0ColourlessMn2+=[Ar]3d5PinkFe3+=[Ar]3d5BrownCo2+=[Ar]3d7Pink

As Sc3+ and Cu+ have 3d0 and 3d10 configuration in their valence shell so their aqueous solutions are colourless. All others, i.e., Ti3+,V3+,Mn2+,Fe3+ and Co2+ are coloured in aqueous medium.


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