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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answer is C.

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Detailed Solution

The hydration enthalpy of alkali metal ions decreases with increase in ionic sizes. Ionic size trend of alkali metal ions:
Li+ < Na+ < K+ < Rb+ < Cs+
Trend of hydration enthalpy of alkali metal ions:
Li+ > Na+ > K+ > Rb+ > Cs+
As lithium ion (Li+) has maximum degree of hydration, it will be least mobile.

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