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The gold numbers of protective colloids ...

The gold numbers of protective colloids `A, B, C,` and `D` are `0.04, 0.002, 10` , and `25` , respectively. The protective powers of `A, B, C` , and `D` are in the order

A

`A lt B lt C lt D`

B

`B lt A lt C lt D`

C

`D lt C lt A lt B`

D

`D lt C lt B lt A`

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Smaller is the 'gold number, of protective colloid, greater is protective power.
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