Question

Colloidal solutions of metals like $Cu,Ag,Au$ and $Pt$ are generally prepared by using:

• A. peptization
• B. bredig's arc method
• C. exchange of solvent
• D. oxidation method

Answer 1

Answer: (B)

bredig's arc method

Colloidal solutions of metals are generally prepared by Bredig's arc method in which an arc is struck between the metal electrodes under the surface of water containing some stabilizing agents such as a track of $KOH$.