This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Will an ENDOthermic reaction have a postive or negative change in enthalpy? A) $+\\Delta H$. B) $-\\Delta H$. C) All the above. D) None of the above. Show Answer Correct Answer: A) $+\\Delta H$. 2. Reaction rates generally decrease as temperature is increased. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. Which is NOT a factor that can be used to INCREASE the speed of a reaction? A) High Concentration of a solution. B) Higher temperature. C) Lower temperature. D) Catalyst. Show Answer Correct Answer: C) Lower temperature. 4. A rectilinear plot of concentration against time of a drug that is degrading by first order yields a declining straight line A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. Any substance that changes the rate of a reaction without being permanently changed or consumed A) Activated complex. B) Enzyme. C) Catalyst. D) Inhibitor. Show Answer Correct Answer: C) Catalyst. 6. Imagine a scenario where Abigail is conducting a chemistry experiment by mixing certain chemicals in a beaker, which reaches equilibrium. According to Le Chatelier's principle, if Abigail adds more of one reactant to the mixture, the system will: A) Increase the concentration of reactants. B) Shift in a direction that reduces the stress. C) Stop the reaction. D) Increase the temperature automatically. Show Answer Correct Answer: B) Shift in a direction that reduces the stress. 7. If activation energy is low, it is ..... for a reaction to start. A) Easy. B) Difficult. C) Neither. D) None of the above. Show Answer Correct Answer: A) Easy. 8. The slope of a semi-log plot of concentration (mcg/ml) against time (days) of a drug following apparent first order degradation is found to be-0.0032. Calculate the degradation rate constant. A) -7.37*10-3 day-1. B) 7.37*10-3 day-1. C) 1.39*10-3 day-1. D) -3.2*10-3 day-1. E) 3.2*10-3 day-1. Show Answer Correct Answer: B) 7.37*10-3 day-1. 9. The process of molecules of one substance collecting on the surface of another A) Adhesion. B) Absorption. C) Cohesion. D) Adsorption. Show Answer Correct Answer: D) Adsorption. 10. Not all collisions between reactant particles result in the formation of products. This could be due toi. the molecules not colliding with sufficient energyii. the concentration of reactants being lowiii. the reaction reaching equilibriumiv. the reactants not colliding in the correct orientation A) All of the above. B) I only. C) Iii only. D) I and iv. Show Answer Correct Answer: D) I and iv. 11. Define activation energy. A) The energy required to break chemical bonds. B) The minimum energy required for a chemical reaction to occur. C) The energy released during a chemical reaction. D) The energy needed to maintain a reaction at equilibrium. Show Answer Correct Answer: B) The minimum energy required for a chemical reaction to occur. 12. The rate constant of the reaction increases by ..... a) a. Increasing the temperatureb) b. Increasing the concentration of reactantsc) c. Carrying out the reaction for longer period d) d. Adding catalyst A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 13. Adding a catalyst to a chemical reaction results in A) A decrease in activation energy and a decrease in the reaction rate. B) A decrease in activation energy and an increase in the reaction rate. C) An increase in activation energy and a decrease in the reaction rate. D) An increase in activation energy and an increase in the reaction rate. Show Answer Correct Answer: B) A decrease in activation energy and an increase in the reaction rate. 14. Higher order(>3) reactions are rare due to A) Low probability of simultaneous collisions of all the reacting species. B) Increase in entropy and activation energy as more molecules are involved. C) Shifting of equilibrium towards reactants due to elastic collisions. D) Loss of active species on collision. Show Answer Correct Answer: A) Low probability of simultaneous collisions of all the reacting species. 15. Solid materials that are capable of adsorbing molecules of gases or liquids onto their surfaces are called ..... catalysts. A) Organic. B) Heterogeneous. C) Complex. D) Elementary. Show Answer Correct Answer: B) Heterogeneous. 16. How does one determine the order of reactants? For example, the orders of A and B in Rate = k[A][B]. A) Experimentally. B) The coefficients in the balanced equation. C) They are given. D) Graphing. Show Answer Correct Answer: A) Experimentally. 17. What is the relationship between reaction rate and concentration for a second order reaction? A) The reaction rate is inversely proportional to the concentration. B) The reaction rate is constant regardless of concentration. C) The reaction rate is proportional to the concentration raised to the first power. D) The reaction rate is proportional to the square of the concentration. Show Answer Correct Answer: D) The reaction rate is proportional to the square of the concentration. 18. What letter represents the activation energy in a reaction? A) A. B) E. C) G. D) H. Show Answer Correct Answer: A) A. 19. Which of the following is incorrect statement A) Catalyst provides an alternative path for the reation. B) Catalyst can decrease the activation energy. C) Catalyst can increase activation energy. D) Threshold energy is the sum of activation energy and energy of reactant. Show Answer Correct Answer: C) Catalyst can increase activation energy. 20. Which of the following is an appropriate dimension for the first order rate? A) Mg/hr. B) Mole.lit-1. C) Hour-1. D) Cal/mole. Show Answer Correct Answer: C) Hour-1. 21. What role do catalysts play in chemical reactions? A) Catalysts speed up chemical reactions by lowering activation energy. B) Catalysts change the products of the reaction to create new substances. C) Catalysts slow down chemical reactions by increasing activation energy. D) Catalysts are consumed in the reaction and do not affect the outcome. Show Answer Correct Answer: A) Catalysts speed up chemical reactions by lowering activation energy. 22. The rate of a reaction increases as temperature ..... A) Decreases. B) Increases. C) Stays the Same. D) None of the above. Show Answer Correct Answer: B) Increases. 23. In a reversible reaction, the activation energies of the forward and the backward reaction are equal. In such reactions A) $\Delta H=0$. B) $\Delta S=0$. C) Order is zero. D) $\Delta H\ne0, \Delta S\ne0$. Show Answer Correct Answer: A) $\Delta H=0$. 24. Olivia is studying a chemical reaction where 2 molecules of substance A react to form 3 molecules of substance B:2A $\rightarrow$ $\\frac{\Delta\left[B\right]}{\Delta t}$ A) $-2[A])/3t$. B) $\frac{\Delta\left[A\right]}{\Delta t}$. C) $\frac{-\Delta\left[A\right]}{\Delta t}$. D) $\frac{-3\Delta\left[A\right]}{2\Delta t}$. Show Answer Correct Answer: D) $\frac{-3\Delta\left[A\right]}{2\Delta t}$. 25. What is half life for first order reaction? A) T$_{1/2 }$= 0.693/k. B) T$_{1/2 }$= 0.683/R. C) T$_{1/2 }$= 1/ k. D) None of the above. Show Answer Correct Answer: A) T$_{1/2 }$= 0.693/k. ← 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 5Class 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books