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Q.

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

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a

K

b

Rb

c

Li

d

Na

answer is C.

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Detailed Solution

The hydration enthalpy of alkali metal ions decreases with increase in ionic sizes i.e.Li+>Na+>K+>Rb+>Cs+Hence, lithium having maximum degree of hydration will be least mobile. The order of ionic mobility isLi(aq)+
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