A) \[SO_{4}^{2-}\]
B) \[{{K}^{+}}\]
C) \[Al{{(S{{O}_{4}})}_{3}}\]
D) \[A{{l}^{3+}}\]
Correct Answer: A
Solution :
[a] \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] is a salt of weak base and a strong acid hence on hydrolysis it will produce\[Al{{(OH)}_{3}}\] and \[{{H}_{2}}S{{O}_{4}}.\] Since \[{{H}_{2}}S{{O}_{4}}\] is a strong acid and \[Al{{(OH)}_{3}}\] is is a weak base hence the solution will be acidic due to \[SO_{4}^{--}.\]
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