The seqeunce of ionic mobility in the aqueous solution is

Options

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

Answer

D

Explanation

More the smaller size of the cations, more will be the hydration takes place, less will be the mobility.
`Cs^(+)gtRb^(+)gtK^(+)gtNa^(+)`.