The correct order of the mobility of the alkali metal ions in aqueous solution is :

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The correct order of the mobility of the alkali metal ions in aqueous solution is :

A $Li^{+} > Na^{+} > K^{+} > Rb^{+}$
B $Na^{+} > K^{+} > Rb^{+} > Li^{+}$
C $K^{+} > Rb^{+} > Na^{+} > Li^{+}$
D $Rb^{+} > K^{+} > Na^{+} > Li^{+}$

Solution & Step-by-step Explanation

The mobility of an ion in an aqueous solution depends on its hydrated radius. The smaller the bare ion, the greater its charge density, and the more extensively it gets hydrated by water molecules. Thus, Li^{+} has the largest hydrated radius and moves the slowest. Rb^{+} has the smallest hydrated radius and exhibits the highest ionic mobility.

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The correct order of the mobility of the alkali metal ions in aqueous solution is :

Li^{+} > Na^{+} > K^{+} > Rb^{+}

Na^{+} > K^{+} > Rb^{+} > Li^{+}

K^{+} > Rb^{+} > Na^{+} > Li^{+}

Rb^{+} > K^{+} > Na^{+} > Li^{+}

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