The aqueous solution of potash alum is acidic due to hydrolysis of

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K+

Al3+

SO4- -

presence of acid in its crystal as impurity

answer is B.

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Detailed Solution

Al3+ having high charge density will associate strongly with water through its fractional negatively charged oxygen pole and in such interaction there will be hydrolysis to some extent :Al3+ + H2O ⇌ AlOH2+ + H+The product cation may hydrolyze further.

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