The correct order of mobility of alkali metal ions in aqueous solution is

Options

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

Answer

B

Explanation

Smaller is size of hydrated ion, more is ionic mobility size : `Li_((aq.))^(+) lt Na_((aq.))^(+) lt K_((aq.))^(+) lt Rb_((aq.))^(+)`