A) \[R{{b}^{+}}\]
B) \[C{{s}^{+}}\]
C) \[L{{i}^{+}}\]
D) \[N{{a}^{+}}\]
Correct Answer: C
Solution :
As we know that hydration power decreases on moving down the group hence among alkali metals Li has excessive hydration & hence it has low mobility in aqeous solution.
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