MDCAT Chemistry MCQ #5100

A student adds a small amount of MnO2 to hydrogen peroxide to speed up its decomposition. How does the catalyst achieve this?

MDCAT Chemistry MCQ #5100

  1. Question 1

    Q1. A student adds a small amount of MnO2 to hydrogen peroxide to speed up its decomposition. How does the catalyst achieve this?

    • A) Decreasing the activation energy
    • B) Increasing the frequency of collisions
    • C) Increasing the heat of reaction
    • D) Decreasing the kinetic energy of reactants

    Answer: Decreasing the activation energy

    Explanation: Catalysts lower activation energy by providing an alternative pathway. Option C is incorrect as catalysts do not change the enthalpy (Delta H).