Which of the following alkali metal ions has the lowest ionic mobility in aqueous solution ?

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${Rb}^{+}$

${Cs}^{+}$

${Li}^{+}$

${Na}^{+}$

answer is C.

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Detailed Solution

As we know that hydration power decreases on moving down the group hence among alkali metals Li has excessive hydration and hence it has low mobility in aqueous solution.

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