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Question

Predict which of the following will be coloured in aqueous solution?

A
Sc3+
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B
Cr3+
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C
V3+
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D
Both (b) and (c)
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Solution

The correct option is D Both (b) and (c)
Only those ions will form colored complexes with H2O which have incompletely filled dorbitals. The ions with either empty or filled dorbitals are colourless.
Out of Sc3+ (3d0), Cr3+ (3d3) and V3+ (3d2), Cr3+ and V3+ contain unpaired electrons while Sc3+ contains empty dorbitals hence, Cr3+ and V3+ will show color in aqueous solution whereas Sc3+ will be colorless in aqueous solution.

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