MCAT General Chemistry Question 76: Answer and Explanation

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Question: 76

1. A reaction is found to stop just before all reactants are converted to products. Which of the following could be true about this reaction?

  • A. The reaction is irreversible, and the forward rate is greater than the reverse rate.
  • B. The reaction is irreversible, and the reverse rate is too large for products to form.
  • C. The reaction is reversible, and the forward rate is equal to the reverse rate.
  • D. The reaction is reversible, and the reverse rate is greater than the forward rate.

Correct Answer: C

Explanation:

This scenario likely describes a situation in which a reaction has reached equilibrium very far to the right (with high product concentration and low reactant concentration). This reaction must be reversible because the reaction did not proceed all the way to the right. Any reaction in equilibrium has equal forward and reverse rates of reaction.

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