For coagulating As_2S_3 colloidal sol,which o | vedclass

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(D) According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion with a charge opposi

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$AlCl_3$

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(D) According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion with a charge opposite to that of the colloidal particles).$As_2S_3$ is a negatively charged sol,so it requires a positively charged ion for coagulation.The coagulating power increases with the increase in the valency of the flocculating ion: $Al^{3+} > Ba^{2+} > Na^+$.Since the coagulation value is inversely proportional to the coagulating power,the electrolyte with the highest valency of the active ion will have the lowest coagulation value.Therefore,$AlCl_3$ has the lowest coagulation value.

For coagulating $As_2S_3$ colloidal sol,which of the following will have the lowest coagulation value?

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