Particles intermediate in size between those in solutions and suspensions form mixtures known as colloidal dispersions.

• A. Colloids
• B. Solute
• C. Suspension
• D. Electrolyte

Answer: (A)

Particles intermediate in size between those in true solutions and suspensions form colloids. Colloids are mixtures where the dispersed particles are large enough to scatter light and be seen under a microscope, yet small enough to remain evenly distributed rather than quickly settle. This gives colloidal dispersions stability and a characteristic appearance, like milk or fog, and they often show the Tyndall effect due to light scattering. In contrast, true solutions have far smaller particles that do not scatter light and are embedded molecularly, while suspensions contain much larger particles that eventually settle out. An electrolyte is a substance that dissociates into ions in solution and isn’t about particle size in dispersions.