Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?
(1) K (2) Rb (3) Li (4) Na

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(3) Li+ being smallest, has maximum charge density. Li+ is most heavily hydrated among all alkali metal ions. Effective size of Li+ in aqueous solution is therefore, largest. So, moves aslowest under electric field.

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