Which one among the following statements is NOT a property of "colloid"?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → The solute particles settle down when left undisturbed, that is, a colloid is unstable.
Colloids are actually stable mixtures. Unlike a suspension (like sand in water), the particles in a colloid are small enough that they are kept in constant motion by collisions with the molecules of the surrounding medium (a phenomenon called Brownian motion). Because of this, the particles do not settle down at the bottom if left undisturbed.