Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
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a
K
b
Rb
c
Li
d
Na
answer is C.
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Detailed Solution
The hydration enthalpy of alkali metal ions decreases with increase in ionic sizes i.e.Li+>Na+>K+>Rb+>Cs+Hence, lithium having maximum degree of hydration will be least mobile. The order of ionic mobility isLi(aq)+