This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the half equation:Cu $\rightarrow$ Cu$^{2+}$ + 2e$^{-}$Copper undergoes ..... A) Spectatorship. B) Reduction. C) Deprotonation. D) Oxidation. Show Answer Correct Answer: D) Oxidation. 2. What is the oxidation number of chlorine in ClO3-? A) +5. B) +3. C) 0. D) -1. Show Answer Correct Answer: A) +5. 3. Which of the following is not a reduction. A) C $\rightarrow$ CH$_{4}$. B) Fe$^{3+}$ $\rightarrow$ Fe$^{2+}$. C) Cl$_{2}$ $\rightarrow$ 2Cl$^{-}$. D) Zn $\rightarrow$ ZnO. Show Answer Correct Answer: D) Zn $\rightarrow$ ZnO. 4. Which of the following half-reactions represents the reduction process? A) $Fe^{2+} \rightarrow Fe^{3+} + e^-$. B) $Cl_2 + 2e^-\rightarrow 2Cl^-$. C) $Zn \rightarrow Zn^{2+} + 2e^-$. D) $H_2 \rightarrow 2H^+ + 2e^-$. Show Answer Correct Answer: B) $Cl_2 + 2e^-\rightarrow 2Cl^-$. 5. Oxidation is the ..... of electrons. A) Loss. B) Gain. C) Sharing. D) Transfer. Show Answer Correct Answer: A) Loss. 6. Which substance is a reducing agent? A) Acidified hydrogen peroxide solution. B) Iron (III) nitrate solution. C) Potassium iodide solution. D) Acidified potassium manganate (VII) solution. Show Answer Correct Answer: C) Potassium iodide solution. 7. Which of following is incorrect about oxidation? A) Addition of oxygen. B) Loss of electron. C) Increase in oxidation state. D) Addition of electopositive element. Show Answer Correct Answer: D) Addition of electopositive element. 8. What is the main focus of redox reactions? A) Oxidation and Reduction. B) Precipitation Reactions. C) Acid-Base Reactions. D) Combustion Reactions. Show Answer Correct Answer: A) Oxidation and Reduction. 9. An Oxidation number can be A) Zero. B) Negative. C) Positive. D) All of Above. Show Answer Correct Answer: D) All of Above. 10. What is the oxidation number of Ca in CaCl$_{2}$? A) -1. B) -2. C) +1. D) +2. Show Answer Correct Answer: D) +2. 11. What is the reducing agent here:N$_{2}$ + 3H$_{2}$ $\rightarrow$ 2H$_{3}$N A) N$_{2}$. B) H$_{2}$. C) H$_{3}$N. D) None of these is the reducing agent. Show Answer Correct Answer: B) H$_{2}$. 12. What is the oxidation state of nitrogen in dinitrogen oxide, N$_{2}$O? A) +1. B) +2. C) -1. D) -2. Show Answer Correct Answer: A) +1. 13. Name the following ionic compound:Cs$_{2}$S A) Cesium sulfide. B) Cesium sulfate. C) Cesium (II) sulfate. D) Cesium (II) sulfide. Show Answer Correct Answer: A) Cesium sulfide. 14. Defined as the loss of electrons. A) Oxidation. B) Reduction. C) Redox. D) OIL RIG. Show Answer Correct Answer: A) Oxidation. 15. Balance the following half reaction in acidic medium and determine the no. of mole of electrons present in it.NO$_{3}$$^{-}$$\rightarrow$ NO A) 4. B) 2. C) 3. D) 1. Show Answer Correct Answer: C) 3. 16. Is this oxidation or reduction:SO$_{4}$$^{2-}$becomes SO$_{2}$ A) Oxidation. B) Reduction. C) Neither. D) Both. Show Answer Correct Answer: B) Reduction. 17. What is the role of a reductant? A) To undergo reduction by giving up electrons. B) To undergo reduction by gaining electrons. C) To undergo oxidation by giving up electrons. D) To undergo oxidation by gaining electrons. Show Answer Correct Answer: C) To undergo oxidation by giving up electrons. 18. Balance the following reactions using the half-reaction method.MnO$_{4}$$^{-}$(aq) + H$^{+}$(aq) + I$^{-}$ (aq) $\rightarrow$ Mn$^{2+}$(aq) + I$_{2}$(s)How many electrons did you cross out on both side? A) 1 e$^{-}$. B) 2 e$^{-}$. C) 5 e$^{-}$. D) 10 e$^{-}$. Show Answer Correct Answer: D) 10 e$^{-}$. 19. Which reagent would be best for the selective reduction of an aldehyde? A) $NaBH_4$. B) $LiAlH_4$. C) $OsO_{4_{ }}$. D) $H_2$. Show Answer Correct Answer: A) $NaBH_4$. 20. Which is true about voltaic cells? A) Convert electrical energy into chemical energy. B) The anode is positive. C) Reduction is at the cathode. D) The reactions are nonspontaneous. Show Answer Correct Answer: C) Reduction is at the cathode. 21. In the reaction Zn + 2HCl $\rightarrow$ ZnCl$_{2}$ + H$_{2}$which element, if any, is reducing agent? A) None. B) Hydrogen. C) Chlorine. D) Zinc. Show Answer Correct Answer: D) Zinc. 22. A solution of sulfuric acid is added to a solution of barium hydroxide; What is the net ionic equation? A) H$_{2}$SO$_{4}$$^{ }$+ Ba$^{2+}$ + OH$^{-}$$\rightarrow$BaSO$_{4}$ + H$_{2}$O. B) H$^{+}$ + OH$^{-}$$\rightarrow$ H$_{2}$O. C) H$_{2}$SO$_{4}$$^{ }$+ Ba$^{2+}$ + OH$^{-}$$\rightarrow$Ba$^{2+}$+ SO$_{4}$ $^{2-}$+ H$_{2}$O. D) H$^{+}$ + SO$_{4}$$^{2-}$+ Ba$^{2+}$ + OH$^{-}$$\rightarrow$BaSO$_{4}$ + H$_{2}$O. Show Answer Correct Answer: D) H$^{+}$ + SO$_{4}$$^{2-}$+ Ba$^{2+}$ + OH$^{-}$$\rightarrow$BaSO$_{4}$ + H$_{2}$O. 23. Which is the correct relationship among free energy, equilibrium, and cell potential? A) If $\Delta$ $>$. B) If $\Delta$ $>$. C) If $\Delta$ $<$. D) If $\Delta$ $>$. Show Answer Correct Answer: A) If $\Delta$ $>$. 24. What happens to the oxidation state of an element that is reduced in a redox reaction? A) It increases. B) It decreases. C) It remains the same. D) It becomes zero. Show Answer Correct Answer: B) It decreases. 25. Explain why the electrolyte has to be a liquid. A) So the ions can move. B) So the electrons can move. C) So that it doesn't get too hot. D) So the fish are ok. Show Answer Correct Answer: A) So the ions can move. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 1Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 2Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 3Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 4Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 5Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 6Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 7Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 8Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 9Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books