NEET 2017 Chemistry question

Not in JEE Main or NEET syllabus

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

(1)Na
(2)K
(3)Rb
(4)LiCorrect

Answer: (4)

Solution

In aqueous solution the ionic mobility depends on the size of the hydrated ion, not the bare ion. is the smallest alkali metal ion and so has the highest charge density; it is the most heavily hydrated, so its hydrated radius is the largest

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Question ID VK-092099