Which of the following alkali metal ions has | vedclass

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(B) In aqueous solution,the ionic mobility depends on the degree of hydration. Smaller ions have a higher charge density,which leads to a greater degr

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$Rb^{+}$

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(B) In aqueous solution,the ionic mobility depends on the degree of hydration. Smaller ions have a higher charge density,which leads to a greater degree of hydration. $Li^{+}$ is the smallest ion,so it gets heavily hydrated,forming a large hydrated ion $[Li(H_2O)_n]^{+}$,which moves slowly. $Rb^{+}$ is the largest ion among the given options,so it has the least degree of hydration,resulting in a smaller hydrated ion size. Therefore,$Rb^{+}$ has the highest ionic mobility in aqueous solution.

Which of the following alkali metal ions has the highest ionic mobility in aqueous solution?

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