Question

When a small amount of an electrolyte is added to a colloidal dispersion, the dispersed phase particles are surrounded by either the anions or the cations. This is because:

• A. The colloidal particles tend to selectively adsorb either positively or negatively charged ions
• B. The ions of the electrolyte remove protons from the dispersion medium
• C. The ions of the electrolyte remove electrons from the dispersion medium
• D. Of Hydrogen bonding

Answer 1

The correct option is A The colloidal particles tend to selectively adsorb either positively or negatively charged ions

We have already seen that Colloidal particles tend to be electrically charged and this is because they tend to selectively adsorb either positively or negatively charged ions. Do note that adsorption is a surface phenomenon and the ions give rise to surface charges. In general, the particles of the dispersed phase all carry equal and similar charges and naturally repel each other. Therefore the particles neither settle down nor aggregate together.