The correct information(s) is/are — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Basic dyes form positively charged sols. Ferrocyanide [Fe(CN)₆]⁴⁻ has a higher charge magnitude than phosphite [HPO₃]²⁻, so it has stronger coagulating power according to Hardy-Schulze rule (a). Starch is a lyophilic sol that can protect lyophobic Fe(OH)₃ sol (b). Zeta potential dictates the electrostatic repulsion between particles; higher zeta potential prevents coagulation and maintains stability (d). Therefore, correct answer is A,B,D.