Gold numbers of protective colloids `A,B,C` and `D` are `0.5,0.01,0.10` and `0.005` respectivaly. The correct order of their protective power is

Options

A. `A lt C lt B lt D`
B. `B lt D lt A lt C`
C. `D lt A lt C lt B`
D. `C lt B lt D lt A`

Answer

A

Explanation

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)`gt ` B (0.01) `gt` C (0.05) ` gt ` A(0.50) or A`lt` C `lt`B lt` D.