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Which has the maximum coagulating pawer for ferric hydroxide colloid?A. `AlCl_(3)`B. `K_(4)[Fe(CN)_(6)]`C. `BeSO_(4)`D. `MgO`

Answer» Correct Answer - B
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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