Which of the following ions is most effective in the coagulation of an arsenious sulphide soluti...

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Which of the following ions is most effective in the coagulation of an arsenious sulphide solution?
(1) \( \mathrm{K}^{+} \)
(2) \( \mathrm{Mg}^{2+} \)
(3) \( \mathrm{Al}^{3+} \)
(4) \( \mathrm{Na}^{+} \)
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