Which of the following will have the highest coagulating power for \( \mathrm{Fe}(\mathrm{OH})_{...

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Which of the following will have the highest coagulating power for \( \mathrm{Fe}(\mathrm{OH})_{3} \) colloid?
(a) \( \mathrm{PO}_{4}^{3-} \)
(b) \( \mathrm{SO}_{4}^{2-} \)
(c) \( \mathrm{Ca}^{2+} \)
(d) \( \mathrm{Al}^{3+} \)
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