The aqueous solution of $A l {C l}_{3}$ is acidic due to:

Cation hydrolysis

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Anion hydrolysis

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Hydrolysis of both the ions

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Dissociation

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Solution

The correct option is A Cation hydrolysis
$A l {C l}_{3}$ is acidic because when you make a solution in water, it will dissociate to form $H C l .$
$A l {C l}_{3} + 3 H_{2} O ⇌ A l {(O H)}_{3} + 3 H C l,$
This $H C l$ is highly acidic and $p H$ decreases gradually.
This occurs due to cation hydrolysis.

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