Q. Which of the following increases the rate of a chemical reaction according to collision theory?
✅ Correct Answer: (C)
Adding a catalyst
Explanation: A catalyst provides an alternative pathway with a lower activation energy, increasing the rate by increasing the fraction of collisions that are effective. Decreasing temperature lowers kinetic energy and reduces reaction rate (option1 wrong). Reducing concentration lowers collision frequency (option2 wrong). Increasing activation energy would decrease the rate (option4 wrong).
Explanation by: Sikhar Chaudhary
A catalyst provides an alternative pathway with a lower activation energy, increasing the rate by increasing the fraction of collisions that are effective. Decreasing temperature lowers kinetic energy and reduces reaction rate (option1 wrong). Reducing concentration lowers collision frequency (option2 wrong). Increasing activation energy would decrease the rate (option4 wrong).