MCAT General Chemistry Question 86: Answer and Explanation
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Question: 86
11. Increasing temperature can alter the Keq of a reaction. Why might increasing temperature indefinitely be unfavorable for changing reaction conditions?
- A. The equilibrium constant has a definite limit that cannot be surpassed.
- B. The products or reactants can decompose at high temperatures.
- C. Increasing temperature would decrease pressure, which may or may not alter reaction conditions.
- D. If a reaction is irreversible, its Keq will resist changes in temperature.
Correct Answer: B
Explanation:
At extremely high temperatures, reactants or products may decompose, which will affect the equilibrium and potentially destroy the desired products. Choice (A) implies that reactions have limits, which is true; however, this does not make increasing temperature unfavorable. Choice (C) is false because increasing temperature would also increase pressure, assuming constant volume. Choice (D) is incorrect because it refers to properties of irreversible reactions which would not be involved in an equilibrium between products and reactants.