For the coagulation of a particular colloidal solution, the order of coagulation power of some elect — Surface Chemistry Chemistry Question

💡 Solution & Explanation

The sequence of coagulating power (PO₄³⁻ > SO₄²⁻ > Cl⁻) points to the anions being the effective coagulating ions, meaning the sol particles are positively charged. For a positive sol: the dispersion medium is negative and moves to the anode (a); the diffused layer holds the counter negative ions (b); basic dyes like methylene blue are positive sols (c). Metal sols are typically negatively charged. Therefore, correct answer is A,B,C.