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) $Na$
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Solution:
- (c) $Li^{+}$being smallest, has maximum charge density.
$\therefore \quad Li^{+}$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.
