Question

The size of colloidal particles ranges between:
A) ${10^{-7}}\,\, - \,\,{10^{-9}}$
B) ${10^{-9}}\,\, - \,\,{10^{-11}}$
C) ${10^{-4}}\,\, - \,\,{10^{-7}}$
D) ${10^{-2}}\,\, - \,\,{10^{-3}}$

Answer 1

Hint:‌ To solve this question, we must first understand some basic concepts about Colloids and its physical properties. Then we need to assess the physical properties related to its particle size and then only we can conclude the correct answer.

Complete step by step solution:
Before we move forward with the solution of this given question, let us first understand some basic concepts about colloids:
Colloids: colloids can be defined as a mixture where one of the substances is split into very minute particles which are dispersed throughout a second substance. The minute particles are known as colloidal particles.
The colloid is a heterogeneous system in which one substance is dispersed as very fine particles in another substance called dispersion medium.
The most important difference between a solution and a colloid is that of particle size. While in a solution, the constituent particles are ions or small molecules, in a colloid, the dispersed phase may consist of particles of a single macromolecule (such as protein or synthetic polymer) or an aggregate of many atoms, ions or molecules.
Colloidal particles are larger than simple molecules but small enough to remain suspended. Their range of diameters is between $1$ and $1000\,\,nm$ $({10^{-4}}\,\,to\,\,{10^{-7}}\,\,cm)$.
So, clearly we can conclude that the correct answer is Option C.

Note:Multiple light scattering coupled with vertical scanning is the most widely used technique to monitor the dispersion state of a product, hence identifying and quantifying destabilization phenomena. It works on concentrated dispersions without dilution. When light is sent through the sample, it is backscattered by the particles / droplets.