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Which of the following alkali metal ions...

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

A

`Rb^(+)`

B

`Cs^(+)`

C

`Li^(+)`

D

`Na^(+)`

Text Solution

Verified by Experts

The correct Answer is:
C
Being heavily hydrated, `Li^(+)` has lowest mobility.
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A Typical characteristic of the representative element is that the first member of each group gives different present in that group. Lithium is no excepton. Through it is the first member of the alkali metal family (group f), it is anomalous in behaviour. This may be attributed to the small size of both Li and Li^(+) ion, high ionisation enthalpy, high polarising power, and non- availability of d-electrons in its valence shell. Which of the following ions has the lowest mobility in aqueous solution ?