Question

A lyophobic colloid cannot be formed by:

• A. mixing dispersed phase and dispersion medium
• B. chemical reactions like hydrolysis
• C. exchange of solvent
• D. peptisation

Answer 1

The correct option is A mixing dispersed phase and dispersion medium

• In Lyophobic sols, substances like metals, their sulphides, etc., when simply mixed with the dispersion medium do not form the colloidal sol.
  
• These colloidal sols need a special method for their preparation.
• When the Dispersed phase and dispersion medium are mixed simply the colloidal sol can't be formed. Hence, they are called irreversbile sols.