Which of the following ions is most effective in the coagulation of arsenious sulphide sol? (a) ...

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Which of the following ions is most effective in the coagulation of arsenious sulphide sol?
(a) \( \mathrm{K}^{+} \)
(b) \( \mathrm{Mg}^{2+} \)
(c) \( \mathrm{Al}^{3+} \)
(d) \( \mathrm{C} \)
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