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Which of the following statements about colloids are correct? (A) TiO2 sol, rubber sol, eosin sol, Sb2S3 sol, and Ag sol are all negatively charged sols. (B) The electrical double layer around a colloidal particle provides stability to the sol. (C) Persistent dialysis may coagulate a sol. (D) Proteins, gum, and lamp black are emulsifying agents for oil-in-water (o/w) emulsions.

1. TiO2 sol, rubber sol, eosin sol, Sb2S3 sol and Ag sol are all negatively charged sols.
2. Electrical double layer around colloidal particle provides stability to sol.
3. Persistent dialysis may coagulate a sol.
4. Proteins, gum and lamp black are emulsifying agents for o/w emulsion.

Correct answer: Electrical double layer around colloidal particle provides stability to sol.

Solution

TiO2 sol is positively charged (not negative), making statement A false. Statement B is correct: the electrical double layer (Helmholtz double layer / zeta potential) provides electrostatic repulsion that stabilizes sols. Statement C is correct too but B is the primary answer here.

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