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The solubility products of \( \mathrm{Mg}(\mathrm{OH})_{2}, \mathrm{Cd}(\mathrm{OH})_{2} \),
P \( \mathrm{Al}(\mathrm{OH})_{3} \) and \( \mathrm{Zn}(\mathrm{OH})_{2} \) are \( 4 \times 10^{-11}, 8 \times 10^{-6} \),

W \( 8.5 \times 10^{-23} \) and \( 1.8 \times 10^{-14} \), respectively. The cation that will precipitate first as hydroxide, on adding limited quantity of \( \mathrm{NH}_{4} \mathrm{OH} \) in a solution containing equimolar amount of metal cations, is
(1) \( \mathrm{Al}^{3+} \)
(2) \( \mathrm{Zn}^{2+} \)
(3) \( \mathrm{Mg}^{2+} \)
(4) \( \mathrm{Cd}^{2+} \)
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