Question

Peptisation is a process in which:
A. Precipitation becomes true solution
B. True solution becomes a suspension
C. A colloid gets coagulation
D. A suspension gets converted into a colloid

Answer 1

Peptisation is a process used to convert the precipitates into stable colloids by adding electrolytic solution and shaking it. The electrolyte breaks the precipitate into colloids. The electrolyte used is known as peptizing agent.

Complete step by step answer:
Peptisation is a method used to form stable colloids with the help of electrolyte which splits and distributes the precipitate into colloids. This method uses charges to form colloids from precipitation . The electrolyte used in the peptisation process is known as peptizing agent.
The precipitate is the solid particles settled down in the solution as it is insoluble in the solution.
Peptization is also known as deflocculation. In other words it is the process of converting precipitate into colloids by shaking it with an electrolytic solution.
The freshly prepared precipitate of aluminium hydroxide cannot be filtered due to presence of fine colloidal particles. To allow filtration, the colloidal suspension is first flocculated by adding salt to the solution.
Example of peptisation is shown below:
Addition of ferric chloride to the ferric hydroxide which is the precipitate, the hydroxide precipitate transfers itself to sol by absorbing ferric ions.
Therefore, the correct option is D.

Note:
Do not get confused with the option as suspension contains solid precipitate which are settled in the bottom of the solution. When colloidal particles possess the same type of electric charge and repel each other and as a result aggregation does not occur.