The correct order of the mobility of the alka | vedclass

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Question

(A) In an aqueous solution,alkali metal ions get hydrated. The extent of hydration depends on the size of the cation; smaller cations have higher char

Vedclass · Accepted Answer

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

Vedclass · Answer

(A) In an aqueous solution,alkali metal ions get hydrated. The extent of hydration depends on the size of the cation; smaller cations have higher charge density and thus higher hydration energy.The order of hydration energy is $Li^{+} > Na^{+} > K^{+} > Rb^{+}$.Due to higher hydration,the effective size of the hydrated $Li^{+}$ ion is the largest,which makes it move the slowest in an electric field.Therefore,the mobility of the ions in an aqueous solution is inversely proportional to their hydrated size,resulting in the order: $Rb^{+} > K^{+} > Na^{+} > Li^{+}$.

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

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