Question

The sequence of ionic mobility in aqueous solution is :

• A. $R{b}^{+}>K^{+}>C{s}^{+}>N{a}^{+}$
• B. $N{a}^{+}>K^{+}>R{b}^{+}>C{s}^{+}$
• C. $K^{+}>N{a}^{+}>R{b}^{+}>C{s}^{+}$
• D. $C{s}^{+}>R{b}^{+}>K^{+}>N{a}^{+}$

Answer 1

The correct option is D $C{s}^{+}>R{b}^{+}>K^{+}>N{a}^{+}$

Smaller the size of cation higher will be hydration and its effective size will increase and mobility of aqueous solution will decrease.

The ionic mobility decreases with increase in atomic size in alkali metal in aqueous solution size order reverses so the order of ionic mobility is

$C{s}^{+}>R{b}^{+}>K^{+}>N{a}^{+}$