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(A) $1$. According to the Hardy-Schulze rule, the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a cha

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$KNO_3$

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(A) $1$. According to the Hardy-Schulze rule, the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge opposite to that of the colloidal sol).$2$. The ferric oxide sol is positively charged, so the coagulating power depends on the valency of the anion.$3$. The anions provided by the electrolytes are: $NO_3^-$ (valency $1$), $SO_4^{2-}$ (valency $2$), $PO_4^{3-}$ (valency $3$), and $[Fe(CN)_6]^{4-}$ (valency $4$).$4$. According to the Hardy-Schulze rule, the coagulating power increases with the increase in the valency of the oppositely charged ion.$5$. Therefore, the ion with the lowest valency $(NO_3^-)$ will have the minimum coagulating power.

Which of the following exhibits the minimum coagulating power for the precipitation of a positively charged ferric oxide sol?

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