1. The rate of a chemical reaction is the change in the
Answer: A. concentration of a reactant or product in a given time
Chemistry Class 10 Unit 5: Reaction Kinetics MCQs
25 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers".
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2. The unit of the rate of reaction is
Answer: C. mol dm⁻³ s⁻¹
3. The rate of a reaction ______ as the reaction proceeds.
Answer: B. decreases
4. On a concentration-time graph, a steeper slope indicates a
Answer: D. faster reaction
5. On a concentration-time graph, a zero slope (flat line) indicates that the reaction has
Answer: D. stopped
6. If 25 mol dm⁻³ of product forms in 100 minutes, the average rate is about
Answer: A. 0.0042 mol dm⁻³ s⁻¹
7. According to collision theory, for a reaction to occur, particles must
Answer: B. collide with enough energy and correct orientation
8. The minimum amount of energy needed for a reaction to occur is called the
Answer: C. activation energy
9. Reactions with high activation energy are usually
Answer: C. slow
10. A catalyst is a substance that
Answer: B. speeds up a reaction without being used up
11. A catalyst increases the rate of reaction by
Answer: A. providing an alternate pathway with lower activation energy
12. In a reversible reaction, a catalyst lowers the activation energy of
Answer: D. both the forward and reverse reactions
13. At the end of a reaction, a catalyst is
Answer: B. chemically unchanged
14. Which of the following is NOT a factor affecting the rate of reaction according to collision theory?
Answer: D. Molar mass of reactants
15. Which of these is NOT typically affected by the rate of reaction?
Answer: A. Colour of the reactants
16. Increasing the concentration of reactants makes the reaction
Answer: C. faster
17. Increasing the surface area of a solid reactant
Answer: C. increases the rate of reaction
18. Powdered zinc reacts faster with dilute HCl than a chunk of zinc because the powder has
Answer: D. more exposed surface area
19. Raising the temperature increases the rate because particles
Answer: B. move faster and have more frequent and energetic collisions
20. How does temperature affect the rate of reaction according to collision theory?
Answer: A. Higher temperature increases the frequency of collisions and the kinetic energy of particles
21. Increasing the pressure of a gaseous reaction mixture
Answer: D. increases the rate of reaction
22. Enzymes are
Answer: A. biological catalysts
23. Each enzyme catalyses
Answer: B. only one specific reaction
24. Enzymes speed up reactions by holding reactant molecules in the correct
Answer: C. orientation for successful collisions
25. In the food industry, chemical kinetics helps to
Answer: B. determine the best time to harvest and transport produce
About Chemistry Class 10 Unit 5 MCQs (Federal Board)
These 25 Chemistry MCQs cover Class 10 Unit 5: Reaction Kinetics of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. You can also read the Reaction Kinetics notes for this chapter. Download the Reaction Kinetics MCQs as a PDF using the button at the top of this page.