Which of the following ions is most effective in the \( \mathrm{P} ...

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Which of the following ions is most effective in the
\( \mathrm{P} \) coagulation of an arsenious sulphide solution?

W
(1) \( \mathrm{K}^{+} \)
(2) \( \mathrm{Mg}^{2+} \)
(3) \( \mathrm{Al}^{3+} \)
(4) \( \mathrm{C} \)
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