Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?

Options

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

Answer

A

Explanation

`Li^(+)` being smallest, has maximum charge density
`:.Li^(+)` is most heavily hydrated among all alkali most Effect size of `Li^(+)` in aqueous solution is therefore,
`:.` Moves slowest under electric field.