If \( \mathrm{NH}_{4} \mathrm{OH} \) in presence of \( \mathrm{NH}_{4} \mathrm{Cl} \) is added t....

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If \( \mathrm{NH}_{4} \mathrm{OH} \) in presence of \( \mathrm{NH}_{4} \mathrm{Cl} \) is added to a solution
\( \mathrm{P} \)
containing \( \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) and \( \mathrm{MgSO}_{4} \), which of the following will precipitate?
(1) \( \mathrm{Mg}(\mathrm{OH})_{2} \) only
(2) \( \mathrm{Al}(\mathrm{OH})_{3} \) and \( \mathrm{Mg}(\mathrm{OH})_{2} \)
(3) \( \mathrm{Al}(\mathrm{OH})_{3} \)
(4) None of these


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