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The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order:
A
$Na^+ < Li^+ < K^+ < Rb^+$
B
$Li^+ < K^+ < Na^+ < Rb^+$
C
$Rb^+ < K^+ < Na^+ < Li^+$
D
$K^+ < Na^+ < Rb^+ < Li^+$
Detailed Solution
The smaller the bare ion, the more it is hydrated: hydrated size is $Li^+ > Na^+ > K^+ > Rb^+$.
The greater the size of the hydrated ion, the greater its surface area and its ease of adsorption (as given in the source solution).
So the ease of adsorption is $Rb^+ < K^+ < Na^+ < Li^+$.
The greater the size of the hydrated ion, the greater its surface area and its ease of adsorption (as given in the source solution).
So the ease of adsorption is $Rb^+ < K^+ < Na^+ < Li^+$.