11. Le Chatelier’s principle applies to which type of chemical system?
- A) Open system
- B) Closed system
- C) Isolated system
- D) None of the above
- Answer: B
12. Le Chatelier’s principle states that if a system at equilibrium is disturbed, it will:
- A) Adjust to increase the disturbance
- B) Remain in the disturbed state
- C) Adjust to minimize the disturbance
- D) Collapse the equilibrium
- Answer: C
13. Which of the following factors can disturb chemical equilibrium?
- A) Change in concentration
- B) Change in temperature
- C) Change in pressure
- D) All of the above
- Answer: D
14. When the concentration of a reactant in a system at equilibrium is increased, Le Chatelier’s principle predicts that the system will:
- A) Shift towards the reactants
- B) Shift towards the products
- C) Remain unchanged
- D) Increase temperature
- Answer: B
15. What happens to the equilibrium position when the pressure is increased in a gaseous reaction involving fewer moles of products?
- A) Shifts towards the reactants
- B) Shifts towards the products
- C) Remains unchanged
- D) Produces more heat
- Answer: B
16. Which of the following does NOT affect the position of equilibrium in a reaction?
- A) Temperature
- B) Catalyst
- C) Concentration
- D) Pressure
- Answer: B
17. According to Le Chatelier’s principle, increasing the temperature of an exothermic reaction will:
- A) Shift equilibrium towards the products
- B) Shift equilibrium towards the reactants
- C) Have no effect on equilibrium
- D) Stop the reaction
- Answer: B
18. Le Chatelier’s principle can be applied to:
- A) Physical equilibrium only
- B) Chemical equilibrium only
- C) Both physical and chemical equilibria
- D) None of the above
- Answer: C
19. In an endothermic reaction, decreasing the temperature will cause the equilibrium to:
- A) Shift to the right
- B) Shift to the left
- C) Remain unchanged
- D) Produce more heat
- Answer: B
20. The addition of an inert gas to a reaction at equilibrium will:
- A) Shift the equilibrium to the right
- B) Shift the equilibrium to the left
- C) Have no effect on the equilibrium position
- D) Increase the pressure
- Answer: C
