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 CLi⨁<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⨁