(A) The correct answer is $A$. $As_2S_3$ is a negatively charged sol. According to the Hardy-Schulze rule,the coagulation of a colloidal solution is b

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(A) The correct answer is $A$. $As_2S_3$ is a negatively charged sol. According to the Hardy-Schulze rule,the coagulation of a colloidal solution is brought about by the addition of an electrolyte containing ions with a charge opposite to that of the colloidal particles.