A) amount of gold present in colloid
B) amount of gold required to present the colloid
C) amount of gold required to break the colloid
D) none of the above
Correct Answer: D
Solution :
The minimum amount of the protective colloid in milligrams required to just prevent the coagulation of a 10 mL of a given gold sol when 1 mL of a 10% solution of sodium chloride is added to it, is known as gold number. Smaller the value of gold number, greater will be protecting power of the protective colloid.
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