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Which of the following is the most effective electrolyte for the coagulation of (Fe2O3.H2O)Fe3+ sol ? `KCl,AlCl_(3),MgCl_(2),K_(4)[Fe(CN)_(6)]`

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since `Fe(OH)_3` sol is positively charged, the anion having highest charge will be most effective i.e., `[Fe(CN)_6]^(3-)`.
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MODERN PUBLICATION-SURFACE CHEMISTRY-CONCEPTUAL QUESTION 2
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  18. Out of sulphur sol and proteins, which one forms multimolecular colloi...

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