A) Gelatin
B) Haemoglobin
C) Sodium oleate
D) Potato starch
Correct Answer: D
Solution :
Key Idea: Gold number of protective colloid is the minimum weight of it in milligram which must be added to 10 mL of a standard gold sol. So that no coagulation of the gold sol takes place when 1 mL of 10% sodium chloride solution is rapidly added to it. Smaller the gold number greater will be protective power. \[\because \] Gold number of gelatin is least. \[\therefore \] Its protecting power is maximum. Among the given choices potato starch has maximum gold number.
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