The reagent \( \mathrm{NH}_{4} \mathrm{Cl} \) and aqueous \( \mathr...

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The reagent \( \mathrm{NH}_{4} \mathrm{Cl} \) and aqueous \( \mathrm{NH}_{3} \) precipitate
P
(1) \( \mathrm{Ca}^{2+} \)
(2) \( \mathrm{Al}^{3+} \)
W
(3) \( \mathrm{Mg}^{2+} \)
(4) \( \mathrm{Zn}^{2+} \)
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