The alkali metal ion which has maximum ionic mobility in aqueous solution
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The alkali metal ion exist as hydrated ions M+(H2O)n in the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence Li+ ion is mostly hydrated e.g. [Li(H2O)6]+.
Remember mobility of ions is inversely proportional to the size of the their hydrated ions.
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