A cleared solution which is again converted into colloidal solution is called:
A) Peptisation
B) Electrolytic addition
C) Electrophoresis
D) None of these

Hint: We have to know that a colloidal solution is the one in which insoluble dispersed particles are suspended into the particles of other substances. A colloidal system can be formed by varying the different states that are gas, liquid or solid. This solution is neither a true solution nor a suspension. A solution may be colored but always transparent in nature.

Complete answer:
We will look at all the options to answer this question.
Option A) this is an incorrect option as Peptisation is the process for the formation of colloidal solution which is asked in the question but the colloidal solution so formed is not from the cleared solution it is formed from a precipitate thus this option is incorrect.
Option B) This is an incorrect option as electrolysis does not lead to the formation of colloidal solution, it is something different. It requires electric current to effect a chemical change.
Option C) this is an incorrect option as electrophoresis does not lead to the formation of colloidal solution thus we can neglect this option also. This is a different process that is used to separate different molecules in a gel or fluid depending upon their charge, their affinities and many more.
Option D) this option is correct as all the given other options are not true for the process asked, thus none of these is an option for this answer.

Note:
We must know that a cleared solution which is again converted into colloidal solution is called Coagulation. It is the destabilization of colloid particles. It is also termed as mixing of coagulants. It leads to the changing in bulk condition of the particles leading to lowering the pH value.