Multiple choice

The correct order of mobilities of alkali metal ions in aqueous solution is

  1. Li+ < Na+ < K+ < Rb+ < Cs+

  2. Cs+ < Rb+ < K+ < Na+ < Li+

  3. Cs+ < Rb+ < Na+

  4. Li+ < K+ < Na+ < Rb+ < Cs+
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A Correct answer
Explanation

With the increase in atomic number, the extent of hydration decreases and hence, the ions become less heavy, which leads to the higher mobility.

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