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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?

1. (a) K
2. (b) Rb
3. (c) Li
4. (d) Na

Correct answer: (c) Li

Solution

The ionic mobility of Li+ is the lowest because it has the smallest ionic radius among alkali metals, leading to the strongest hydration and the largest effective size in aqueous solution, which reduces its mobility.

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