Question

Lyophilic solutions are:
A. Irreversible solutions
B. Prepared from inorganic compounds
C. Not coagulated by adding electrolysis
D. Self-stabilizing

Answer 1

Hint: We have to remember that the sol is a colloid made up of very small solid particles in a continuous medium. The particles are solid and the dispersion medium is fluid. They are stable and possess Tyndall effect. They can also be prepared by dispersion or by condensation process. Let’s look at the properties of sols.

Complete step by step answer:
We have to remember that if the dispersed phase has greater affinity for the dispersion which is called as lyophilic while water acts as dispersion medium which is called as hydrophilic or natural colloids. Examples: rubber, proteins.
Now we discuss about the properties of lyophilic sols as follows,
-They are highly viscous.
-They are reversible.
-Particles are so fine that they cannot be seen under a microscope.
-Highly stable, they possess self-stabilizing properties.
-Addition of little electrolyte affects a little, which means it coagulates to a lower extent.
-Hydrates easily (soluble in water)
From all the above properties we have to the following conclusions with respect to the question:-
-Lyophilic sols are reversible solutions.
-They are prepared from organic compounds (solid particles) which are easily suspended in fluid.
-They can be coagulated to a small extent by adding little electrolyte.
-Though they are reversible, they have self-stabilizing properties.
So, the correct answer is “Option D”.

Note:
We have to know that colloidal solutions exist in two different states. One is called sol which is in a fluid state. Another is gel which is a semi-solid gooey substance. As we know that the sols are lyophilic and lyophobic in nature. The lyophobic sols have the properties opposite to the lyophilic sols. Lyophilic sols are so called lyophilic because they strongly disperse in the dispersing medium or solvent in other terms. They do not precipitate easily. In a solution, the solute particles have strong affinity with the dissolving medium (solvent).