Electrochemistry - Result Question 2

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

(a) K

(b) Rb

(c) Li

(d) Na

Show Answer

Solution:

  1. (c) Li+being smallest, has maximum charge density.

∴Li+is most heavily hydrated among all alkali metal ions. Effective size of Li+in aqueous solution is therefore, largest. So, moves slowest under electric field.

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