CUET Preparation Today
Which one among the following statements is NOT a property of "colloid"? |
It is a heterogenous mixture. The solute particles settle down when left undisturbed, that is, a colloid is unstable. The size of particles is too small to be individually seen by the naked eyes. Colloids are big enough to scatter a beam of light passing through it and make its path visible. |
The solute particles settle down when left undisturbed, that is, a colloid is unstable. |
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. |
