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Question

The mobility of metal ions in an aqueous medium (Li,Na,K,Rb) in an electric field, follows the order:

A
Li>Na>K>Rb
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B
Rb>Na=K>Li
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C
Li<Na<K<Rb
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D
Na=K>Rb>Li
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Solution

The correct option is C Li<Na<K<Rb
Mobility of ions is inversely proportional to the size of hydrated ions. The order of size of hydrated ions is Li>Na>K>Rb due to high charge density.
Therefore order of mobility is: Li<Na<K<Rb

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