Colloidal systems like Gold sol and Sulphur sol exhibit the Tyndall effect and cannot be filtered by — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Gold atoms and Sulphur molecules ($S_8$) are intrinsically smaller than $1\text{ nm}$. To form a colloidal solution, a large number of these individual atoms or smaller molecules must aggregate together until the resulting clusters reach the colloidal size range ($1-1000\text{ nm}$). Thus, they are termed multimolecular colloids.