NEET 2012 Chemistry question

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?

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

Answer: (2)

Solution

The pH of a salt solution depends on the hydrolysis of its ions. and are small, highly charged cations with high polarising power; they are strongly hydrolysed (e.g. )_6]^{3+}\rightleftharpoons [Al(H_2O)_5OH]^{2+}$ +

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Question ID VK-091099