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Gold number of protective colloids A, B,...

Gold number of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005 respectively. The correct order of their protecting power

A

`D lt A lt C lt B`

B

`A lt C lt B lt D`

C

`B lt D lt A lt C`

D

`C lt B lt D lt A`

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