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Which of the following ions will exhibit colour in aqueous solutions?

1. La3+ (Z = 57)
2. Ti3+ (Z = 22)
3. Lu3+ (Z = 71)
4. Sc3+ (Z = 21)

Correct answer: Ti3+ (Z = 22)

Solution

Ti3+ (Z = 22) exhibits color in aqueous solutions because it has an unpaired electron in its d-orbital, allowing d-d transitions. The other ions (La3+, Lu3+, Sc3+) have no unpaired d-electrons, so they are colorless.

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