question_answer

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field? [NEET-2017]

A) Li

B) Na

C) K

D) Rb

Correct Answer: A

Solution :

            [a] being smallest, has maximum charge density is most heavily hydrated among all alkali metal ions. Effective size of in aq solution is therefore, largest. Moves slowest under electric field.