Question

Freshly prepared precipitate sometimes gets converted to colloidal solution by:

• A. coagulation
• B. electrolysis
• C. diffusion
• D. peptisation

Answer 1

The correct option is D peptisation

• 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.
  
• During peptization, the precipitate adsorbs one of the ions of the electrolyte on its surface. This causes the development of a positive or negative charge on precipitates, which ultimately break up into smaller particles of the size of a colloid.
  
• Hence, freshly prepared precipitate sometimes gets converted to colloidal solution by peptization.