A) \[R{{b}^{+}}\]
B) \[C{{s}^{+}}\]
C) \[L{{i}^{+}}\]
D) \[N{{a}^{+}}\]
Correct Answer: C
Solution :
Key Idea: Smaller ions are hydrated to greater extent. As a result they had largest size and least mobility. \[\because \] \[L{{i}^{+}}\] is smallest cation among\[L{{i}^{+}},\,\,\,N{{a}^{+}},\,\,\,C{{s}^{+}}\] and \[R{{b}^{+}}\]. It is most extensively hydrated. Has least mobility in aqueous solution.
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