This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 (8 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Mathematically, pH is defined as; A) PH =-log[OH$^{+}$]. B) PH = log[H$^{+}$]. C) PH =-antilog[H$^{+}$]. D) PH =-log[H$^{+}$]. Show Answer Correct Answer: D) PH =-log[H$^{+}$]. 2. Using the Arrhenius Plot, the reaction rate was determined as 0.02mg.ml-1.day-1 for a zero-order reaction at 25C. The initial concentration of the drug was 500mg.ml-1. A) 2.5 years. B) 6.85 years. C) 61 years. D) 5.27 years. Show Answer Correct Answer: B) 6.85 years. 3. Given the balanced equation representing a reaction:2HCl(aq) + Na$_{2}$S$_{2}$O$_{3}$(aq) $\rightarrow$ S(s) + H$_{2}$SO$_{3}$(aq) + 2NaCl(aq)Decreasing the concentration of Na$_{2}$S$_{2}$O$_{3}$(aq) decreases the rate of reaction because the: A) Activation energy increases. B) Frequency of effective collisions decreases. C) Frequency of effective collisions increases. D) Activation energy decreases. Show Answer Correct Answer: B) Frequency of effective collisions decreases. 4. Factors affecting rate of the reaction A) Nature of the reactants. B) Temperature. C) Light. D) All the above. Show Answer Correct Answer: D) All the above. 5. Which explains why increasing the temperature increases the rate of a chemical reaction? A) Reactant particles are more likely to be in the gaseous state at higher temperatures. B) More reactant particles possess energy greater than or equal to the activation energy. C) The activation energy decreases at higher temperatures. D) Reactant particles travel faster at higher temperatures. Show Answer Correct Answer: B) More reactant particles possess energy greater than or equal to the activation energy. 6. Reaction between ionic substance is ..... than covalent substance. A) Slower. B) Faster. C) Both are same. D) None. Show Answer Correct Answer: B) Faster. 7. Degradation rate constant was 3.478 mg.ml-1.hr-1. What is the order of the reaction? A) Zero. B) First. C) All the above. D) None of the above. Show Answer Correct Answer: A) Zero. 8. The minimum amount of energy required for the reacting molecules to undergo reaction is called:a) a. Potential energyb) b. Internal energyc) c Activation energy d) d. Threshold energy A) A. B) C. C) B. D) D. Show Answer Correct Answer: B) C. ← PreviousRelated QuizzesScience QuizzesClass 12 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books