How is Gold-sol prepared by Bredig's-arc method?

Explanation

This process involves dispersion as well as condensation. It is used to prepare sols of metals such as gold, silver, platinum etc.
`implies`. In this method, electric arc is struck between electrodes of the metal immersed in the dispersion medium containing a little alkali.
`implies` The intense heat produced vaporizes the metal which then condenses to form particles of colloidal size. The colloidal particles formed adsorb charges from the solution and get stabilized.