[poll id=”159″]
ANSWER
D. Increasing the pressure
Answer choices A-C all cause the reaction to shift to the left (towards the reactants). Increasing the pressure shifts the reaction towards the side with the fewer molecules (in this case, the product side). Thus, increasing the pressure shifts the reaction to the right to restore equilibrium.
Le Chatelier’s principle is almost guaranteed to be seen in the general chemistry OAT section in one form or another.