Question

Which of the following alkali metal ions has the lowest mobility in aqueous solution?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Though $L{i}^{+}$ has the smallest size yet it is most highly hydrated $L{i}^{+}(H_{2}O{)}_6$ and hence its effective size becomes greater than any other hydrated alkali metal cation andthe lowest mobility