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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

(b) Rb

(c) Li

(d) Na
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3. li - due to high charge/size ratio it will hydrolyse to a greater extent and hence become the largest atom in group 1. due to its large size the ability to move(mobility) will get hampered.
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