Question

When a small quantity of $FeC{l}_3$ solution is added to the fresh precipitate of $Fe(OH{)}_3$, a colloidal sol is obtained. The process through which this sol is formed is known as:

• A. exchange of solvent
• B. chemical double decomposition
• C. peptization
• D. electrophoresis

Answer 1

The correct option is C peptization

• Peptization may be defined as the process of converting a precipitate into colloidal sol by shaking it with dispersion medium in the presence of a small amount of electrolyte.
  
• The electrolyte used for this purpose is called a peptizing agent.
  
• When a small quantity of $FeC{l}_3$ solution is added to fresh precipitate of $Fe(OH{)}_3$ the precipitate is converted into colloidal sol, which is nothing but the process of peptization.