The formed colloid in following reaction is: SnO₂ + HCl (Excess) → — Surface Chemistry Chemistry Question

💡 Solution & Explanation

SnO₂ reacts with excess HCl to form a sol of SnCl₄. Due to the presence of excess HCl, common chloride (Cl⁻) ions are preferentially adsorbed on the particles, resulting in a negatively charged sol represented as SnCl₄/Cl⁻. Therefore, correct answer is A.