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(D) The $AgI / Ag^{+}$ sol is a positively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the val

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$NaCl$

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(D) The $AgI / Ag^{+}$ sol is a positively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the oppositely charged ion (anion in this case). Greater the valency of the flocculating ion,greater is its coagulating power. Coagulating power is inversely proportional to the coagulating value. The valency of the anions are: $PO_{4}^{3-} (3) > SO_{4}^{2-} (2) = S^{2-} (2) > Cl^{-} (1)$. Since $Cl^{-}$ has the lowest valency,it has the minimum coagulating power and therefore the maximum coagulating value.

Which of the following electrolytes will have maximum coagulating value for $AgI / Ag^{+}$ sol?

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