The seqeunce of ionic mobility in the aqueous solution is

Options

A. `K^(+)gtNa^(+)gtRb^(+)gtC s^(+)`
B. `Cs^(+)gtRb^(+)gtK^(+)gtNa^(+)`
C. `Rb^(+)gtK^(+)gtCs^(+)gtNa^(+)`
D. `Na^(+)gtK^(+)gtRb^(+)gtCs^(+)`

Answer

B

Explanation

Smaller the size of the ion, more stronger it is hydrated and less is the ionic mobility. The sizes of the unhydrated ions increase in the order.
`Na^(+)ltK^(+)ltRb^(+)ltCs^(+)`
The size of the hydrated ions will be in the order `CsltRb^(+)ltK^(+)ltNa^(+)`