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The correct order of mobility of alkali ...

The correct order of mobility of alkali metal ions in aqueous solution is

A

`K^(+) gt Na^(+) gt Rb^(+) gt Cs^(+)`

B

`Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+)`

C

`Rb^(+) gt K^(+) gt Cs^(+) gt Na^(+)`

D

`Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
The smaller the size of the ion, the greater is the degree of hydration, thus degree of hydration is highest of `Li^+` and lowest for `Cs^+`. Thus `Li^+` holds more water molecules in its hydration sphere and becomes largest in size among metals and `Cs^+` ion hold least number of water molecules .
Hence, ionic mobility is highest for `Cs^+` (due to its smallest size in aqueous solution ) and lowest for `Li^+`.Here the lowest is for `Na^+`. Thus, the order of ionic mobility in aqueous solution is
`Cs^(+) gt Rb^+ gt K^+ gt Na^+`
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