Which of the following has maximum coagulating power with ferric hydroxide sol
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Explanation:
Ferric hydroxide is a postitive sol, `[Fe(OH)_(3)]Fe^(3+)`. Hence, to coagulate it, an anion is needed . `K_(4)[Fe(CN)_(6)]` gives the tetravalent anion `[Fe(CN)_(6)]^(4-)` , hence it has the greatest coagulating power among these (Hardy-Schulze law).
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