1.

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

Answer»

Na
K
Rb
Li

SOLUTION :`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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