The ion that is more effective for the coagulation of \( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol ...

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The ion that is more effective for the coagulation of \( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol is
(a) \( \mathrm{Ba}^{2+} \)
(b) \( \mathrm{Na}^{+} \)
(c) \( \mathrm{PO}_{4}^{3-} \)
(d) \( \mathrm{AI}^{3+} \)
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