Question

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

• A. Sulphur
• B. Ferric hydroxide
• C. Arsenious sulphide
• D. Gold

Answer 1

Answer: (D)

Gold

Answer 2

Gold colloid can be prepared by Bredig arc method as well as by reduction of $AuCl_{3}$ with $SnCl_{2}$