Least mobile ion is

In aqueous solution, Li^(+) ion has the least mobility among alkali metals. Why?

The ion having highest mobility in aqueous solution is

The ion having highest mobility in aqueous solutionis

Which alkali metal ion has lowest mobility in aqueous solution ?

Assertion : Li^(+) ions has the lowest mobility in aqueous solution Reason : Li^(+) ion has very high ionisation enthalpy.

The least stable ion among the following is

The least stable ion among the following is