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(D) Ferric hydroxide sol is a positively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valen

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$K_3[Fe(CN)_6]$

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(D) Ferric hydroxide 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). The higher the valency of the flocculating ion,the greater is its coagulating power. The anions provided are $Cl^-$,$NO_3^-$,$SO_4^{2-}$,and $[Fe(CN)_6]^{3-}$. Since the valency of $[Fe(CN)_6]^{3-}$ is the highest $(3)$,it is the most effective in coagulating the positively charged ferric hydroxide sol.

Which of the following is most effective in coagulating a ferric hydroxide sol?

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