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Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
Explanation
Heavy hydration makes $Li^+(aq)$ the largest and slowest ion.
Detailed Solution
$Li^+$, being smallest, has maximum charge density.
$\therefore$ $Li^+$ is the most heavily hydrated among all alkali metal ions, so its effective size in aqueous solution is the largest.
$\therefore$ It moves slowest under an electric field.