A) starch
B) egg albumin
C) gelatin
D) gum Arabic
Correct Answer: C
Solution :
Gold number is the number of milligrams of the protective colloid required to just prevent the coagulation of gold sol solution when 1 mL of 10% solution of\[NaCl\]is added to it. Gold number Starch 20-25 Egg albumin 0.1 - 0.2 Gelatin 0.005 - 0.01 Gum arabic 0.15 - 0.25 \[\therefore \]Gelatin has minimum gold number.
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