Colloid of which one of the following can prepared by electrical dispersion method as well as reduction method ?

Colloid of which one of the following can prepared by electrical dispe

1.	Colloid of which one of the following can prepared by electrical dispersion method as well as reduction method ?
Answer» Sulphur Ferric hydroxide Arrhenius sulphide Gold Solution :Gold SOL by Bredig's METHOD .(Dispersion method) and by REDUCTION method `(AuCl_(3)+` Tannic ACID `to` Gold sol).