Question

Gold sol can be prepared by Bredig's arc method.

• A. True
• B. False

Answer 1

The correct option is A True

Bredig's arc method is a method of preparation of colloidal solution of metals such as gold, silver or platinum. This method consists of both dispersion and condensation. An arc is struck between electrodes under the surface of water containing some stabilizing agent such as traces of KOH (potassium hydroxide). The intense heat of the arc vaporizes some of the metal which then condenses under cold water.