Answer:
Arsenic sulphide \[(A{{s}_{2}}{{S}_{3}})\]
sol has a negative charge on it. To cause its coagulation or precepitation, the
active ions must be positively charged. According to Hardy-SchuIze rule,
greater the magnitude of the positive charge on the ion, more will be its
coagulating power. Thus, \[AlC{{l}_{3}}\] containing \[A{{l}^{3+}}\] ions will
be the most effective in causing the coagulation of the sol.
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