Which of the following factors could increase the reaction rate? 2A + B2 → 2AB
(I) decreasing the temperature
(II) adding a catalyst
(III) increasing the surface area of solid reactants

Question

Quizplus · Accepted Answer

Decreasing the temperature (I) would actually decrease the reaction rate, so option A and C can be eliminated. 
Adding a catalyst (II) and increasing the surface area of solid reactants (III) both help to increase the reaction rate by providing more effective collisions between reactant molecules. Therefore, D is the best choice.

Which of the Following Factors Could Increase the Reaction Rate