Question

Bredig's arc cannot be used to prepare colloidal soluntion

Answer 1

Hey !

Expected options are:

1) Pt

2) Fe

3) Ag

4) Au

Answer :- Bredig's arc method is suitable for the preparations of colloidal solutions of metals like gold, silver,platinum etc. An Arc is struck between the metal electrodes under the surface of water containing some stabilizing agent such as a trace of KOH.

                 However, Fe does not react with alkalies that is why it is not obtained by Bredig's arc method.

GOOD LUCK !