Question
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
-
Na
-
K
-
Rb
-
Li
Solution
D.
Li
Li+ being smallest has maximum charge density
∴ Li+ is most heavily hydrated among all alkali metal ions. The effective size of Li+ in aq solution is therefore, largest.
∴ Moves slowest under the electric field.
