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The p-Block Elements
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
Na
K
Rb
Li
D.
Li
Li+ being smallest has maximum charge density
∴ Li+ is most heavily hydrated among all alkali metal ions. The effective size of Li+ in aq solution is therefore, largest.
∴ Moves slowest under the electric field.
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