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

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a
K+
b
Al3+
c
SO4- -
d
presence of acid in its crystal as impurity

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detailed solution

Correct option is B

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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Which of the following salts when dissolved in water will get hydrolysed ?


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