Question

Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.01 and 0.005 respectively. The correct order of their protective powers is

• A. A < C < B < D
• B. B < D < A < C
• C. D < A < C < B
• D. C < B < D < A.

Answer 1

Answer: (A)

A < C < B < D

Answer 2

Smaller the gold number, greater is the protective power. Thus protective power of $A, B, C$ and $D$ are in the order $D (0.005)>\,B(0.01)>\,C(0.05)>\,A(0.50)$ or $A