Question

Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a better protective colloid ?

• A. Gelatin
• B. Gum Arabic
• C. Oleate
• D. Starch

Answer 1

Answer: (A)

Gelatin

Answer 2

Gold number $\propto \frac{1}{Protective\,power}$