21. Which statement is true about the characteristics of K?

• A) K is independent of temperature
• B) K depends on the initial concentration of reactants
• C) K only changes with temperature
• D) K can be altered by adding a catalyst
• Answer: C

22. If Δn = 2 for a gaseous reaction, the relationship between Kp and Kc is:

• A) ( Kp = Kc(RT)^2 )
• B) ( Kp = Kc \times (RT)^2 )
• C) ( Kp = Kc/(RT)^2 )
• D) ( Kp = Kc(RT)^3 )
• Answer: B

23. The value of Kc for a reaction is 10 at 300 K. If Δn = 0, what is the value of Kp at the same temperature?

• A) 5
• B) 10
• C) 100
• D) Cannot be determined
• Answer: B

24. Which reaction characteristic is directly related to the equilibrium constant K?

• A) Reaction rate
• B) Extent of the reaction
• C) Reaction pathway
• D) Activation energy
• Answer: B

25. For the reaction ( 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g) ), if Kp and Kc are known, what is Δn?

• A) 0
• B) 1
• C) -1
• D) 2
• Answer: C

26. Kp and Kc are equal for a reaction when:

• A) There is no change in the number of moles of gases
• B) The number of moles of products is greater than the reactants
• C) The reaction is exothermic
• D) The temperature is low
• Answer: A

27. For a gaseous reaction, if Δn = 1, the relationship between Kp and Kc is:

• A) ( Kp = Kc \times RT )
• B) ( Kp = Kc/(RT) )
• C) ( Kp = Kc \times (RT)^2 )
• D) ( Kp = Kc \times RT^{-1} )
• Answer: A

28. Which of the following will increase the value of the equilibrium constant K?

• A) Decreasing temperature for an exothermic reaction
• B) Increasing temperature for an exothermic reaction
• C) Decreasing temperature for an endothermic reaction
• D) Increasing pressure
• Answer: A

29. The equilibrium constant K for a reaction is a measure of:

• A) The speed of the reaction
• B) The extent of the reaction at equilibrium
• C) The temperature at which equilibrium is achieved
• D) The pressure of the reactants
• Answer: B

30. What is the relationship between Kc and Kp for the reaction ( 2NO(g) + O_2(g) \rightleftharpoons 2NO_2(g) )?

• A) ( Kp = Kc \times (RT)^2 )
• B) ( Kp = Kc \times (RT) )
• C) ( Kp = Kc/(RT) )
• D) ( Kp = Kc \times RT^{-1} )
• Answer: C