1. Which of the following is true about the activation energy of a reaction?
    • A) It is the energy required to reach the transition state.
    • B) It is the energy released during the reaction.
    • C) It is the energy of the products.
    • D) It is the difference between the energy of the reactants and products.
    • Answer: A) It is the energy required to reach the transition state.
  2. What is the effect of a catalyst on the reaction mechanism?
    • A) It introduces a new intermediate.
    • B) It increases the activation energy.
    • C) It changes the enthalpy of the reaction.
    • D) It decreases the activation energy by providing an alternative pathway.
    • Answer: D) It decreases the activation energy by providing an alternative pathway.
  3. In the reaction A + B → C, if the reaction is second-order with respect to A and first-order with respect to B, what is the overall reaction order?
    • A) Zero-order
    • B) First-order
    • C) Second-order
    • D) Third-order
    • Answer: D) Third-order
  4. Which of the following best describes the equilibrium constant K?
    • A) It is dependent on the concentration of reactants and products.
    • B) It changes with the pressure of the reaction system.
    • C) It varies with temperature but not with pressure.
    • D) It is affected by the presence of a catalyst.
    • Answer: C) It varies with temperature but not with pressure.
  5. What is the impact of increasing the concentration of a reactant on the rate of reaction if the reaction is zero-order with respect to that reactant?
    • A) The rate of reaction increases.
    • B) The rate of reaction decreases.
    • C) The rate of reaction remains constant.
    • D) The rate of reaction becomes zero.
    • Answer: C) The rate of reaction remains constant.
  6. What does the rate constant (k) of a reaction depend on?
    • A) Concentration of reactants
    • B) Temperature
    • C) Pressure
    • D) Catalyst
    • Answer: B) Temperature
  7. Which of the following factors does not affect the equilibrium constant of a reaction?
    • A) Temperature
    • B) Pressure
    • C) Concentration of reactants
    • D) Presence of a catalyst
    • Answer: D) Presence of a catalyst
  8. What happens to the reaction rate when the temperature is increased for an exothermic reaction?
    • A) The reaction rate decreases.
    • B) The reaction rate remains constant.
    • C) The reaction rate increases.
    • D) The reaction rate becomes zero.
    • Answer: C) The reaction rate increases.
  9. Which of the following is true for a reaction with a rate constant of 2.5 L^2/mol^2s?
    • A) The reaction is second-order.
    • B) The reaction is first-order.
    • C) The reaction is zero-order.
    • D) The reaction is third-order.
    • Answer: A) The reaction is second-order.
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