Multiple choice

The gold numbers of four protective colloids P, Q, R and S are 0.005, 0.01, 10 and 25 respectively. The decreasing order of their protective power is

  1. R > Q > P > S

  2. P > Q > R > S

  3. S > R > Q > P

  4. Q > R > P > S
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Protective power is inversely proportional to the gold number. A lower gold number means higher protective power; therefore, the order is P > Q > R > S.

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