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The size of the colloidal particles is in between:
(a) ${ 10 }^{ -7 }-{ 10 `}^{ -9 }$ cm
(b) ${ 10 }^{ -9 }-{ 10 }^{ -11 }$ cm
(c) ${ 10 }^{ -4 }-{ 10 }^{ -7 }$ cm
(d) ${ 10 }^{ -2 }-{ 10 }^{ -3 }$ cm

Last updated date: 21st Jul 2024
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Hint: Generally the most common techniques to determine the size of the particle size distribution is dynamic image analysis (DIA), static laser light scattering (SLS) and sieve analysis. You should know that the colloidal particles can be seen with an ultra microscope. Now try to figure out the size of the colloidal particles by yourself.

Complete step by step answer:
Let us first see what colloids are.
> Colloids are those substances which are amorphous in nature and whose solutions were unable to pass through the membrane. It is a substance microscopically dispersed evenly throughout another substance.
Example, Milk is an emulsion which is a colloid in which both particles are liquids.
> A colloidal solution, sometimes known as colloidal suspension, in simple words it a solution in which a material is evenly suspended in a liquid. It is basically a type of mixture which appears to be homogenous, but actually is heterogeneous. Its particles are not large enough to be seen by naked eye.
> In a colloid, the particles never settle down. The size of the particle is between 1nm-1000nm.
Therefore, the size of the colloidal particle is between ${ 10 }^{ -4 }-{ 10 }^{ -7 }$. Hence option C Is the required answer.

Note: You should know that the most common and practical method of removing colloidal particles is done by chemical coagulation. It is basically the process of destabilizing colloids.