NEET 2008 Chemistry question

The sequence of ionic mobility in aqueous solution is

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

In aqueous solution the ions are hydrated. The smaller the bare ion, the higher its charge density, so it attracts more water molecules (larger hydration energy and larger hydrated radius) and moves more slowly. Hydrated size:

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Question ID VK-090003