Question:
In which of the following ions are correctly arranged with respect to their mobilities in aqueous solution?
In which of the following ions are correctly arranged with respect to their mobilities in aqueous solution?
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Greater hydration = lower mobility. Smaller ions are more strongly hydrated.
Updated On: Jun 19, 2026
- \(K^+ > Na^+ > Cs^+ > Li^+\)
- \(Li^+ > K^+ > Na^+ > Cs^+\)
- \(Cs^+ > K^+ > Na^+ > Li^+\)
- \(Na^+ > K^+ > Cs^+ > Li^+\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding ionic mobility.
Ionic mobility in aqueous solution depends mainly on ionic size and hydration. Smaller ions have higher charge density and get heavily hydrated, which reduces their mobility.
Step 2: Hydration effect.
Among alkali metal ions, \(Li^+\) is the smallest and gets most strongly hydrated, hence shows lowest mobility. \(Cs^+\) is largest and least hydrated, hence highest mobility.
Step 3: Trend analysis.
Therefore, mobility increases as hydration decreases: \[ Cs^+ > K^+ > Na^+ > Li^+ \]
Step 4: Final justification.
The trend is governed by effective hydrated radius rather than bare ionic radius. Larger ions move more freely in solution.
Step 5: Final conclusion.
Thus, correct order of mobility is \(Cs^+ > K^+ > Na^+ > Li^+\).
Final Answer: \[ \boxed{Cs^+ > K^+ > Na^+ > Li^+} \]
Ionic mobility in aqueous solution depends mainly on ionic size and hydration. Smaller ions have higher charge density and get heavily hydrated, which reduces their mobility.
Step 2: Hydration effect.
Among alkali metal ions, \(Li^+\) is the smallest and gets most strongly hydrated, hence shows lowest mobility. \(Cs^+\) is largest and least hydrated, hence highest mobility.
Step 3: Trend analysis.
Therefore, mobility increases as hydration decreases: \[ Cs^+ > K^+ > Na^+ > Li^+ \]
Step 4: Final justification.
The trend is governed by effective hydrated radius rather than bare ionic radius. Larger ions move more freely in solution.
Step 5: Final conclusion.
Thus, correct order of mobility is \(Cs^+ > K^+ > Na^+ > Li^+\).
Final Answer: \[ \boxed{Cs^+ > K^+ > Na^+ > Li^+} \]
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