Which of the following ions is most effective in the coagulation of an arsenious suphide solution?

Which of the following ions is most effective in the coagulation of an arsenious suphide solution?
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Which of the following ions is most effective in the coagulation of an arsenious suphide solution? A. `K^(+)` B. `Mg^(2+)` C. `Al^(3+)` D. `C`
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