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

Question

Which one of the following ions has the largest size in aqueous solution? (A) Rb + (B) Na + (C) K + (D) Li +

Tardigrade Admin · Accepted Answer

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.

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

$R b^{+}$

$N a^{+}$

$K^{+}$

$L i^{4}$

Smaller the ion more is the extent of hydration. The hydration enthalpies of alkali metal ions decrease with increase in ionic size
$L^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$
$L i^{+}$ has the maximum degree of hydration.