Question

If gold number of $A,B,C$, and $D$ are $0.005,0.05,0.5$, and $5$ respectively, then which of the following will have the highest protective power.

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (A)

Protective power $\propto \frac{1}{\text{ Gold number }}$

Gold number of $A$ is least, therefore, it has the highest protective power.