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Answer: 3. Li

Key idea: in aqueous solution ionic mobility falls with greater hydration, and smaller ions hydrate more.

Hydrated size order is \(\mathrm{Li^+>Na^+>K^+>Rb^+}\), so mobility order is \(\mathrm{Li^+

The key copy we had (option 2, Rb) does not agree with this, so it was corrected.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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