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Gold Number

The gold numb...

Question

The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively. The protective powers of A, B, C and D are in the order:

A

A > B > C > D

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B

B > A > C > D

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C

D > C > A > B

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D

D > C > B > A

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Solution

The correct option is B
B > A > C > D

The smaller the 'gold number' of the protective colloid, greater is its protective power.

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