Free Le Chatelier's Principle MCQs with Answers
26 Le Chatelier's Principle MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
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26 questions · page 2 of 2
- A. Both pressure and temperature are increased
- B. Both pressure and temperature are decreased
- C. Temperature is decreased and pressure is increased
- D. Temperature is increased and pressure is increased
Explanation: The reaction 2SO2 + O2 → 2SO3 is exothermic, releasing heat. According to Le Chatelier's principle, increasing pressure shifts the…
Correct answer: Temperature is decreased and pressure is increased- A. Is independent of temperature
- B. Increases as temperature increases
- C. Decreases as temperature increases
- D. Varies with the addition of N2 and O2
Explanation: In general, for an exothermic reaction, the reaction rate decreases as the temperature increases.
Correct answer: Decreases as temperature increases- A. Increase in temperature
- B. Decrease in temperature
- C. No change in temperature
- D. First increase and then decrease in temperature
Explanation: Increasing the temperature of the system provides more heat energy to the reaction, which helps drive the reaction toward the reactant side.
Correct answer: Increase in temperature- A. Endothermic process
- B. Exothermic process
- C. Vaporization process
- D. Change of H2O into O2 and H2
Explanation: The ionic product of water (Kw) is the product of the concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in water.
Correct answer: Endothermic process- A. The equilibrium will shift in the backward direction
- B. The equilibrium position will remain unchanged
- C. The equilibrium will shift in the forward direction
- D. All of the above
Explanation: In an endothermic reaction such as N2(g) + O2(g) → 2NO(g), increasing the temperature provides additional heat that the system can absorb.
Correct answer: The equilibrium will shift in the forward direction- A. Forward direction
- B. Reverse direction
- C. To all system at equilibrium
- D. None of the above
Explanation: By increasing the pressure, the equilibrium between ice and water will shift in the direction of the phase with the lower volume, which is…
Correct answer: Forward direction