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Question

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?


A
K
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B
Rb
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C
Li
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D
Na
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Solution

The correct option is C Li

As we go down the group, the size of the ionic radius increases. This implies that the charge per surface area (or charge density = charge per unit volume) is the highest for Li+. Hence, in the solvated state, the hydration sphere is the largest for Li+. Hence, its ionic mobility will also be the lowest.


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