Read the Assertion and Reason below and choose the correct option. — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Colloidal sols scatter light (Tyndall effect) because their particles are large enough (1 nm to 1000 nm) compared to the particles in a true solution (< 1 nm). It is also true that colloidal particles, being more massive, diffuse and move more slowly than the ions or small molecules in a true solution. However, the slower movement is not the cause of light scattering; the particle size is. Therefore, correct answer is B.