On adding ammonium hydroxide solution to Al_2(SO_4)_3 (aq):

JEE Main Chemistry question

On adding ammonium hydroxide solution to :

(A)A precipitate is formed which does not dissolve in excess of ammonium hydroxideCorrect
(B)A precipitate is formed which dissolves readily in excess of ammonium hydroxide
(C)No precipitate is formed
(D)None of the above

Answer: (A)

Solution

reacts with the weak base ammonia to precipitate ; being only a weak base, aqueous ammonia cannot supply enough hydroxide ion concentration to redissolve the amphoteric precipitate as the aluminate ion

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Question ID VK-138645