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)

A

Answer 2

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

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