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Ionic mobility of which of the following...

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?

A

Na

B

K

C

Rb

D

Li

Text Solution

Verified by Experts

The correct Answer is:
D
`Li^(+)` ion is smallest and has maximum charge density. As a result, in aqueous solution, it is most heavily hydrated out of all the alka lie metal ions. Thus, hydrated `Li^(+)` has largest size. Hence, its mobility is lowest under the electric field.
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