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Problem 6 - Olympiad
The gold number of a protective colloid is defined as:
A. The number of milligrams required to prevent flocculation of 100 mL of gold sol
B. The minimum concentration needed to stabilize a lyophobic sol
C. The surface area per unit mass of the colloid
D. The ratio of gold particles to the number of colloidal particles
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Correct: A
Gold number quantifies the protective power of colloids by determining how much is needed to prevent coagulation of a gold sol system.