This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When you double the concentration of this reactant the rate of the reaction doesn't change. It is ..... order A) First. B) Second. C) Zero. D) None of the above. Show Answer Correct Answer: C) Zero. 2. When the temperature increases, the rate of reaction: A) Decreases. B) Increases. C) Remains constant. D) Is unpredictable. Show Answer Correct Answer: B) Increases. 3. Describe how inhibitors affect reaction rates. A) Inhibitors increase reaction rates by enhancing enzyme activity. B) Inhibitors decrease reaction rates by preventing enzyme-substrate interactions. C) Inhibitors have no effect on reaction rates whatsoever. D) Inhibitors only affect the temperature of the reaction. Show Answer Correct Answer: B) Inhibitors decrease reaction rates by preventing enzyme-substrate interactions. 4. Suppose the activation energy of a certain reaction is 250 kJ/mol. If the rate constant at T$_{1}$ = 300 K is k$_{1}$ and the rate constant at T$_{2}$ = 320 K is k$_{2}$, then the reaction is ..... times faster at 320 K than at 300 K. (Hint:Solve for k$_{2}$/k$_{1}$.) A) 525. B) 3 x 10$^{-29}$. C) 15.0. D) 0.067. Show Answer Correct Answer: A) 525. 5. The rate of reaction for the decomposition of hydrogen peroxide decreases with time because A) Product of reaction decreases. B) Temperature of hydrogen peroxide decreases. C) Volume of hydrogen peroxide decreases. D) Concentration of hydrogen peroxide decreases. Show Answer Correct Answer: D) Concentration of hydrogen peroxide decreases. 6. What is the Arrhenius equation and what does it represent? A) The Arrhenius equation is used to determine the pH of a solution. B) The Arrhenius equation relates the rate of a chemical reaction to temperature and activation energy. C) The Arrhenius equation calculates the pressure of a gas. D) The Arrhenius equation describes the relationship between concentration and volume. Show Answer Correct Answer: B) The Arrhenius equation relates the rate of a chemical reaction to temperature and activation energy. 7. The amount of solute needed to form a saturated solution in a given quantity of solvent is known as the solubility of that solvent. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. What is the unit of rate for a reaction involving concentration in mol L-1? A) L mol-1 s-1. B) Mol L-1. C) S-1. D) Mol L-1 s-1. Show Answer Correct Answer: D) Mol L-1 s-1. 9. Under the collision theory, the particles must collide with ..... and ..... for a reaction to occur. A) Sufficient rate and sufficient energy. B) Sufficient surface area and correct orientation. C) Sufficient catalyst and sufficient energy. D) Sufficent energy and correct orientation. Show Answer Correct Answer: D) Sufficent energy and correct orientation. 10. Radioactive decay follows A) 1st order. B) 2nd order. C) 3rd order. D) 0 order. Show Answer Correct Answer: A) 1st order. 11. How do concentration changes affect reaction rates? A) Concentration changes have no effect on reaction rates. B) Higher concentration decreases reaction rates due to fewer collisions. C) Lower concentration increases reaction rates by slowing down collisions. D) Higher concentration increases reaction rates due to more frequent collisions. Show Answer Correct Answer: D) Higher concentration increases reaction rates due to more frequent collisions. 12. Rate of the reaction is usually doubled or tripled as temperature is increased due to increase in A) Internal energy. B) External energy. C) Effective collision. D) Ineffective collision. Show Answer Correct Answer: C) Effective collision. 13. Rate Constant unit of first order reaction A) Per second. B) Second. C) Mol/sec. D) L/mol/sec. Show Answer Correct Answer: A) Per second. 14. The half-life of a first-order reaction is 10 minutes. How much time is required for the reactant concentration to decrease to 25% of its initial value? A) 10 minutes. B) 20 minutes. C) 30 minutes. D) 40 minutes. Show Answer Correct Answer: B) 20 minutes. 15. For a zero-order reaction, half-life is given by: A) T$_{1/2}$= $\frac{0.693}{K}$. B) T$_{1/2}$= $\frac{\left[A\right]_0}{2K}$. C) T$_{1/2}$= $\frac{1}{K\left[A\right]_0}$. D) T$_{1/2}$= $K\left[A\right]_0$. Show Answer Correct Answer: B) T$_{1/2}$= $\frac{\left[A\right]_0}{2K}$. 16. For a second-order reaction, if 1/[A] vs. t has a slope of 0.02 L/mol/s, the rate constant is: A) 0.02 L/mol/s. B) 0.04 L/mol/s. C) 0.01 L/mol/s. D) 0.05 L/mol/s. Show Answer Correct Answer: A) 0.02 L/mol/s. 17. What is the theory which explains how chemical reaction occurs? A) Diffusion. B) Big Bang. C) Collision. D) Emulsion. Show Answer Correct Answer: C) Collision. 18. The rate constant of a reaction depends upon A) Temperature of the reaction. B) Extent of the reaction. C) Initial concentration of the reactants. D) The time of completion of reaction. Show Answer Correct Answer: D) The time of completion of reaction. 19. In a reaction where the rate is determined by the concentration of a single reactant, what is the order of the reaction? A) Zero order. B) First order. C) Second order. D) Third order. Show Answer Correct Answer: B) First order. 20. What is the unit for first order degradation rate constant? A) Time. B) Reciprocal of time. C) Time/concentration. D) Concentration time. Show Answer Correct Answer: B) Reciprocal of time. 21. A catalyst increases the rate of a reaction by: A) Increasing activation energy. B) Increasing the energy of reactants. C) Providing an alternative pathway with lower activation energy. D) Increasing temperature. Show Answer Correct Answer: C) Providing an alternative pathway with lower activation energy. 22. The theory that says in order for a reaction to occur, reactants must have sufficient energy and collide in a correct orientation. A) Activation Energy Theory. B) Collision Theory. C) Activated Complex Theory. D) Dalton's Theory. Show Answer Correct Answer: B) Collision Theory. 23. For a drug degrading by zero order kinetics, concentration of the drug decreases with time in an exponential trend. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 24. What is Integrated rate equation for First order reaction? A) Log r$_{0 }$-log r = kt/ 2.303. B) R$_{0 }$-R = kt. C) Both a and b. D) None of the above. Show Answer Correct Answer: A) Log r$_{0 }$-log r = kt/ 2.303. 25. Catalyst get used up in the reaction A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 1Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 2Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 3Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 4Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 6Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 7Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 8Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 9Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 10Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books