Which of the following would introduce the greatest increase in the rate of the chemical reaction below?

Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l)

A. An increase in temperature and decrease in the concentration of the reactant
B. A decrease in the volume and increase in the pressure of the reactant
C. A decrease in the temperature and an increase in the concentration of the reactant
D. An increase in temperature and an increase in the concentration of the reactant

Correct Answer:

Option D – An increase in temperature and an increase in the concentration of the reactant