The sequence of ionic mobility in aqueous solutions is -

Options

A. `Rb^(+) gt K^(+) gt Cs^(+) gt Na^(+)`
B. `Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`
C. `K^(+) gt Na^(+) gt Rb^(+) gt Cs^(+)`
D. `Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+)`

Answer

D

Explanation

As smaller the size of cation, higher will be hydration and its effective size will increase so mobility in aqueous solution will decrease.