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Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.05 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
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  • Smaller the gold number, greater is the protective power.
Answer: A < C < B < D
Smaller the gold number, greater is the protective power. Thus Gold numbers of the protective colloids A, B, C and D are in the order:
D (0.005) > B (0.01) > C 0.05) > A (0.50)
Thus, in the order of protective powers: A < C < B < D
answered Mar 17, 2014 by mosymeow_1
 

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