1. Tardigrade
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  4. The sequence of ionic mobility in aqueous solution is

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Q. The sequence of ionic mobility in aqueous solution is

AIPMTAIPMT 2008The s-Block Elements

Solution:

The smaller the size of the ion, the greater is the degree of hydration, thus degree of hydration is highest for $Li^+$ and lowest for $Cs^+$. Thus, $Li^+$ holds more water molecules in its hydration sphere and becomes largest in size among alkali metals and $Cs^+$ ion hold least number of water molecules. Hence, ionic mobility in highest for $ Cs^+$ (due to its smallest size in aqueous solution) and lowest for $Li^+$ Thus, the order of ionic mobility in aqueous solution is
$ Cs^+ > Rb^+ > K^+ > Na^+ $