p-Block elementsHard

Question

Aqueous solution of potash alum is:

Options

A.alkaline
B.acidic
C.neutral
D.soapy

Solution

It is acidic because of the hydrolysis of Al2(SO4)3 according to the following reaction.
Al2 (SO4)3 + 6H2O → 2Al(OH)3 + 3H2SO4.

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