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Which one of the following ionic species will impart colour to an aqueous solution?

1. Ti4+
2. Cu+
3. Zn2+
4. Cr3+

Correct answer: Cr3+

Solution

Cr3+ imparts color to an aqueous solution because it has unpaired d-electrons, which allow d-d transitions. The other ions (Ti4+, Cu+, Zn2+) either lack d-electrons or have a completely filled d-orbital, making them colorless.

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