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The aqueous solution containing which one of the following ions will be colourless? (Atomic number: Sc = 21, Fe = 26, Ti = 22, Mn = 25)

1. Sc3+
2. Fe2+
3. Ti3+
4. Mn2+

Correct answer: Sc3+

Solution

Sc3+ has no unpaired electrons in its d-orbital (d0 configuration), making it colourless. The other ions have unpaired d-electrons, which allow d-d transitions and impart colour.

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