A) gum arable
B) starch
C) egg albumin
D) gelatin
Correct Answer: D
Solution :
The gold number is introduced by Zsigmondy and can be defined as: The number of milligrams of a hydrophilic colloid that will just prevent the precipitation of \[10mL\] of a gold sol on the addition of \[1mL\] of \[10%\] sodium chloride solution is called as gold number. The gold number of some protective colloids is: Gelatin 0.005-0.01 Casein 0.01-0.02 Albumin 0.1-0.2 Gum arabic 0.15 - 0.25 Hence, gelatin has lowest gold number.
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