NEET levelSingle correct optionDifficulty 1 of 3sc121
A protective colloid has a very small gold number. This means that the colloid
Ahas a low protective power
Bcannot protect a gold sol at all
Ccoagulates a gold sol readily
Dhas a high protective power
Answer: D
The gold number is the minimum mass of protective colloid that prevents coagulation of a fixed gold sol. A smaller mass is needed for a better protector, so a small gold number means high protective power.