Which of the following alkali metal ions has the lowest ionic mobility in aqueous solutions?

Options

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

Answer

A

Explanation

Since solvent is not mentioned so ionic mobility `prop` charge density `( `charge `//` size `)` .
`Li^(o+)` has the highest charge density. But in aqueous solution, due to extensive hydration, its mobility becomes lowest amongst the other ions of first group of periodic table.