Question

The stability of lyophilic colloids is due to:
a.) Charge on their particles
b.) Large size of their particles
c.) Smaller size of their particles
d.) A layer of medium of dispersion on their particles

Answer 1

Hint: To answer this question knowledge of colloid and lyophilic is required. A colloid is a substance microscopically dispersed evenly throughout another substance. And lyophilic colloid is a type of colloid. For stability we have to see the force between particles of this solution and reason of this force etc.

Complete step by step answer:
We shall know that lyophilic colloids are colloids where the particles have a strong affinity for the liquid it is dispersed in. These types of colloids are very stable and easy to prepare. Typically they can be prepared simply by mixing the particles with the liquid, sometime with the addition of heat.
These are the colloidal solutions in which dispersed particles have strong affinity for dispersion medium and these sols are stable and reversible. For example: starch, gum, gelatin sol etc. Some other examples are metal in water, ferric hydroxide sol etc.
And also we know that lyophilic colloids are liquid loving colloids (Lyo means solvent and philic means loving). When these colloids are mixed with the suitable liquid, a high force of attraction exists between colloidal particles and liquid.
So, the correct answer is “Option D”.

Note: There is another type of colloid solution lyophobic which is reversible in nature and can say water hating or dispersed phase has no attraction for the dispersion medium or the solvent.