Which factors can increase the rate of a chemical reaction?

I.     Increasing the pressure in gaseous reactions

II.     Increasing the temperature in gaseous reactions

III.     Increasing the particle size of a solid in a reaction

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A

There was a concern about the use of the word “can” in the question stem. The word was used to make the question about reactions in general. It does not seem to have troubled the candidates; it was the seventh easiest question, answered correctly by nearly 80% of the candidates.