Question

Freshly prepared precipitate sometimes gets converted to colloidal solution by
(A) Coagulation
(B) Electrolysis
(C) Diffusion
(D) Peptization

Answer 1

Hint : Peptization is the process for the formation of converting precipitate into colloid by shaking it with an electrolyte. During the process of peptization, precipitate is formed at the bottom of the beaker in which peptization occurs.

Complete Step By Step Answer:
This question belongs to the concept of states of matter. Let us see the basic terminologies used here.
Precipitate: After a chemical reaction the leftover substance which is insoluble in the solution is called precipitate. In simple words precipitate is the extra substance formed with the product.
Colloidal solution: It is a solution in which particles are suspended .They are also known as colloids. The size of the suspended particles falls in the range from $1$ to $1000$ nanometres ( ${10^{ - 9}}$ metres). Colloidal solutions also exhibit the Tyndall Effect, in the phenomenon the beams of light incident on colloids are scattered because of the interactions between the light and the colloidal particles.
Coagulation: It is also called clotting. The process by which blood changes from a liquid to gel form is called coagulation. In this mechanism the coagulation involves activation, adhesion and aggregation of platelets, also deposition after maturation of fibrin.
Electrolysis: It is defined as the process in which decomposition of ionic compounds into their elements occur by passing a direct electric current through the compound in liquid form. Cations undergo reduction process at cathode end and anions undergo oxidation at the anode end.
Diffusion: When two substances are kept at different concentrations separated by a thin membrane then the movement of higher concentration substance to lower concentration substance is called diffusion.
Peptization: Peptization is the process in which the precipitate gets converted into colloid by shaking it with an electrolyte.
Hence we can conclude that peptization is the process by which freshly prepared precipitate sometimes gets converted to colloidal solution.
So option D is the correct answer.

Note :
Remember all the terminologies discussed here. Peptization and coagulation are not the same. The minimization of peptization is also possible by washing the precipitate by a solution of electrolyte.