1. Tardigrade
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  4. Which one of the following ions has the largest size in aqueous solution?

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Q. Which one of the following ions has the largest size in aqueous solution?

The s-Block Elements

Solution:

Smaller the ion more is the extent of hydration. The hydration enthalpies of alkali metal ions decrease with increase in ionic size
$L ^{+}> Na ^{+}> K ^{+}> Rb ^{+}> Cs ^{+}$
$Li ^{+}$has the maximum degree of hydration.