NEET 2008 Chemistry question

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

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

Answer: (3)

Solution

All four are chlorides of group 2 metals (salts of strong acid HCl). The pH of their solutions depends on the extent of hydrolysis of the cation: the smaller and more highly charged the cation (higher charge density), the more it hydrolyses and makes the solution acidic. Hydrolysis decreases down the group:

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Question ID VK-090018