This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part Ii > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 10 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Give the oxidation numbers of all the elements in the following molecules and ions:ClO2 A) -3, -2. B) +4, -2. C) -4, -3. D) -2, +2. Show Answer Correct Answer: B) +4, -2. 2. Identify the reducing agent in the reaction:Fe2O3 + 3CO $\rightarrow$ 2Fe + 3CO2. A) Fe2O3. B) CO2. C) O2. D) CO. Show Answer Correct Answer: D) CO. 3. Which statement best describes the energy conversion in a fuel cell? A) Thermal energy to electrical energy. B) Electrical energy to chemical energy. C) Chemical energy to electrical energy. D) Mechanical energy to electrical energy. Show Answer Correct Answer: C) Chemical energy to electrical energy. 4. What does the gain of electrons indicate? A) Precipitation. B) Displacement. C) Oxidation. D) Reduction. Show Answer Correct Answer: D) Reduction. 5. Secondary Cells contain ..... A) Constant supply of fuel. B) Electrolysis of water. C) Consumable chemicals. D) A reversible reaction when charge is applied. Show Answer Correct Answer: D) A reversible reaction when charge is applied. 6. How do you balance the redox equation for the reaction of zinc with copper(II) sulfate? A) Zn + CuSO4 $\rightarrow$ Cu + ZnSO4. B) Zn + CuSO4 $\rightarrow$ ZnSO4 + Cu. C) Cu + ZnSO4 $\rightarrow$ CuSO4 + Zn. D) ZnSO4 + Cu $\rightarrow$ Zn + CuSO4. Show Answer Correct Answer: B) Zn + CuSO4 $\rightarrow$ ZnSO4 + Cu. 7. The oxidation number of fluorine is always? A) 0. B) +2. C) -1. D) -2. E) +1. Show Answer Correct Answer: C) -1. 8. In the reaction:Zn + Cu$^{2+}$ $\rightarrow$ A) Is reduced. B) Is oxidized. C) All the above. D) None of the above. Show Answer Correct Answer: A) Is reduced. 9. Determine the oxidation number of each element in PF$_{4}$$^{+}$ A) P:+4, F:-4. B) P:+5, F:-4. C) P:+4, F:-1. D) P:+5, F:-1. Show Answer Correct Answer: D) P:+5, F:-1. 10. In which of the following compounds the oxidation state of the oxygen atom is not equal to (-2)? A) H$_{2}$O$_{2}$. B) H$_{2}$CO$_{3}$. C) CO$_{2}$. D) H$_{2}$O. Show Answer Correct Answer: A) H$_{2}$O$_{2}$. 11. Using the half-reaction method, how would you balance the reaction of MnO4-with Fe2+ in acidic solution? A) MnO4-+ 10H+ + 5Fe2+ $\rightarrow$ Mn2+ + 5H2O + 5Fe3+. B) MnO4-+ 4H+ + 2Fe2+ $\rightarrow$ Mn2+ + 2H2O + 2Fe3+. C) MnO4-+ 8H+ + 5Fe2+ $\rightarrow$ Mn2+ + 4H2O + 5Fe3+. D) MnO4-+ 6H+ + 3Fe2+ $\rightarrow$ Mn3+ + 3H2O + 3Fe3+. Show Answer Correct Answer: C) MnO4-+ 8H+ + 5Fe2+ $\rightarrow$ Mn2+ + 4H2O + 5Fe3+. 12. Positive ions (cations) move towards the cathode (-) where they will discharge by ..... A) Clumping together. B) Gaining electrons. C) Losing electrons. D) Breaking apart. Show Answer Correct Answer: B) Gaining electrons. 13. An increase in oxidation number is: A) Less basic. B) Reduction. C) More acidic. D) Oxidation. Show Answer Correct Answer: D) Oxidation. 14. A method to control the rusting of underground iron pipelines is through sacrificial protection. Which of the following is the sacrificial metal? A) Copper. B) Tin. C) Lead. D) Zinc. Show Answer Correct Answer: D) Zinc. 15. A solution, when treated with sulfur dioxide gas, becomes green. The solution contains potassium A) Manganate(VII). B) Dichromate(VI). C) Nitrate. D) Sulfate. Show Answer Correct Answer: B) Dichromate(VI). 16. Which of the following compounds can act as a strong oxidizing agent? A) NaCl. B) HCl. C) KMnO4. D) H2O. Show Answer Correct Answer: C) KMnO4. 17. A reaction that has a negative $\Delta$H value. A) Endo. B) Exo. C) All the above. D) None of the above. Show Answer Correct Answer: B) Exo. 18. Which species undergoes a gain of electrons?Zn$_{(s)}$ + Mg$^{2+}$$_{(}$$_{aq) }$$\rightarrow$ Zn$^{2+}$$_{(aq)}$$^{ }$+ Mg$^{ }$$_{(s}$$_{)}$ A) Mg$^{2+}$Fe$^{2+}$. B) Zn. C) Mg. D) Zn$^{2+}$. Show Answer Correct Answer: A) Mg$^{2+}$Fe$^{2+}$. 19. Which of the following is a correctly balanced reduction half-reaction? Tick all that apply. A) Fe$^{3+}$ + e$^{-}$ $\rightarrow$ Fe. B) 2Fe + 6HNO$_{3}$ $\rightarrow$ 2Fe(NO$_{3}$)$_{3}$ + 3H$_{2}$. C) O$_{2}$ + 2H$^{+ }$+ 2e$^{-}$$\rightarrow$ 2H$_{2}$O. D) Mg$^{2+}$ + 2e$^{-}$ $\rightarrow$ Mg. E) Mn$^{2+}$ + 4H$_{2}$O $\rightarrow$ MnO$_{4}$$^{-}$ + 8H$^{+}$ + 5e$^{-}$. Show Answer Correct Answer: D) Mg$^{2+}$ + 2e$^{-}$ $\rightarrow$ Mg. 20. ..... keeps track of the movement of electrons. A) Oxidation state. B) Coefficient. C) Subscript. D) None of the above. Show Answer Correct Answer: A) Oxidation state. 21. What method is used to balance redox reactions? A) Half reaction method. B) Full reaction method. C) Neutralization method. D) Equation method. Show Answer Correct Answer: A) Half reaction method. 22. What is the half-reaction method? A) A technique to balance redox reactions by separating oxidation and reduction processes into two half-reactions. B) A method for calculating the concentration of solutions in chemistry. C) A way to determine the molecular weight of compounds. D) A process for identifying the types of chemical bonds in a molecule. Show Answer Correct Answer: A) A technique to balance redox reactions by separating oxidation and reduction processes into two half-reactions. 23. What is the net ionic equation for the reaction between K$_{3}$PO$_{4 (aq)}$ and CuSO$_{4 (aq)}$? A) 2 K$^{+}$$_{(aq)}$ + SO$_{4}$$^{2-}$$_{(aq)}$ $\rightarrow$ K$_{2}$SO$_{4 (s)}$. B) Cu$^{2+}$$_{(aq)}$ + PO$_{4}$$^{3-}$$_{(aq)}$ $\rightarrow$ CuPO$_{4 (s)}$. C) K$^{+}$$_{(aq)}$ + SO$_{4}$$^{2-}$$_{(aq)}$ $\rightarrow$ KSO$_{4 (s)}$. D) 2 Cu$^{2+}$$_{(aq)}$ + 3 PO$_{4}$$^{3-}$$_{(aq)}$ $\rightarrow$ Cu$_{3}$(PO$_{4}$)$_{2 (s)}$. Show Answer Correct Answer: D) 2 Cu$^{2+}$$_{(aq)}$ + 3 PO$_{4}$$^{3-}$$_{(aq)}$ $\rightarrow$ Cu$_{3}$(PO$_{4}$)$_{2 (s)}$. 24. Al (s) + FeSO$_{4}$ (aq) $\rightarrow$ Al$_{2}$(SO$_{4}$)$_{3}$ (aq) + Fe (s)Which statements are true about this reaction?I. It is a disproportionation reaction.II. It is a single displacement reaction.III. It is an oxidation-reduction reaction. A) I and II only. B) I and III only. C) II and III only. D) I, II and III. Show Answer Correct Answer: C) II and III only. 25. Which transormation could take place at the anode of an electrochemical cell? A) F$_{2}$ to F$^{-}$. B) O$_{2}$ to H$_{2}$O. C) Cr$_{2}$O$_{7}$$^{2-}$to Cr$^{2+}$. D) HAsO$_{2}$ to As. E) None of the above could take place at the anode. Show Answer Correct Answer: E) None of the above could take place at the anode. 26. What is an oxidizing agent? A) It is the species that creates electrons. B) It is the species that gets reduced gains electrons. C) It is the species that loses electrons. D) It is the species that gets oxidized loses electrons. Show Answer Correct Answer: B) It is the species that gets reduced gains electrons. 27. Which of the following is a characteristic of redox titrations? A) They are only performed in acidic solutions. B) They only involve acids and bases. C) They can use self-indicators. D) They do not require any indicators. Show Answer Correct Answer: C) They can use self-indicators. 28. What is the coefficient of Fe$^{3+}$ when the follow equation is balanced?CN$^{-}$ + Fe$^{3+}$ $\rightarrow$ CNO$^{-}$+ Fe$^{2+}$ (basic solution) A) 5. B) 4. C) 2. D) 3. E) 1. Show Answer Correct Answer: C) 2. 29. In the reaction @@ext{2H} ..... 2 + ext{O} ..... 2 ightarrow 2ext{H} ..... 2ext{O}@@, which element is oxidized? A) Hydrogen (H 2). B) Oxygen (O 2). C) Water (H 2O). D) None. Show Answer Correct Answer: A) Hydrogen (H 2). 30. What is the total oxidation number of all atoms in a neutral compound? A) 1. B) -1. C) 2. D) 0. Show Answer Correct Answer: D) 0. 31. What change occurs during oxidation? A) Loss of electrons. B) Gain of elections. C) Gain of hydrogen. D) Loss of oxygen. Show Answer Correct Answer: A) Loss of electrons. 32. What was the Haber process used for? A) Creating water from hydrogen and oxygen. B) Converting atmospheric nitrogen into ammonia. C) Producing oxygen for industrial use. D) Extracting silver from its ore. Show Answer Correct Answer: B) Converting atmospheric nitrogen into ammonia. 33. For the electrochemical cell Ni(s) | Ni$^{2+}$(1 M) || H$^{+}$(1 M) | H$_{2}$(1 atm) | Pt(s), which one of the following changes will cause a decrease in the cell voltage? A) Increase the pressure of H$_{2}$ to 2.0 atm . B) Decrease the mass of the nickel electrode. C) Lower the pH of the cell electrolyte. D) Decrease the concentration of Ni$^{2+}$ ion. E) None of these. Show Answer Correct Answer: A) Increase the pressure of H$_{2}$ to 2.0 atm . 34. What is oxidation state of chlorine in Cl2 molecule? A) -2. B) -1. C) 1. D) 0. Show Answer Correct Answer: D) 0. 35. Which of the following processes relies on redox chemistry? A) Condensation. B) Evaporation. C) Filtration. D) Photosynthesis. Show Answer Correct Answer: D) Photosynthesis. 36. What is the oxidation number of an element in its elemental form? A) +1. B) +2. C) 0. D) -1. Show Answer Correct Answer: C) 0. 37. What is the oxidation number for Cl in NaClO$_{3}$? A) +1. B) -1. C) +5. D) +3. Show Answer Correct Answer: C) +5. 38. How do you identify the oxidizing agent in a redox reaction involving KMnO4? A) KMnO4 acts as an oxidizing agent only in acidic solutions. B) KMnO4 is the oxidizing agent when it is reduced from Mn(+7) to a lower oxidation state. C) The oxidizing agent is identified by its increase in oxidation state during the reaction. D) KMnO4 is the reducing agent when it is oxidized from Mn(+4) to a higher oxidation state. Show Answer Correct Answer: B) KMnO4 is the oxidizing agent when it is reduced from Mn(+7) to a lower oxidation state. 39. Oxidation state shown by alkaline earth metal is A) -2. B) -1. C) 1. D) 2. Show Answer Correct Answer: D) 2. 40. In the reaction Zn$_{(s)}$ + Fe$^{2+}$$_{(aq)}$ $\rightarrow$ Zn$^{2+}$$_{(aq)}$ + Fe$_{(s), }$which is the oxidant? A) Fe$_{(s)}$. B) Zn$^{2+}$$_{(aq)}$. C) Fe$^{2+}$$_{(aq)}$. D) Zn$_{(s)}$. Show Answer Correct Answer: C) Fe$^{2+}$$_{(aq)}$. 41. Of the following elements, ..... is the most easily oxidized. A) Gold. B) Nitrogen. C) Aluminum. D) Oxygen. E) Fluorine. Show Answer Correct Answer: C) Aluminum. 42. Oxidation state of nitrogen in lithium nitrite Li3N A) -2. B) +5. C) +3. D) -3. Show Answer Correct Answer: D) -3. 43. Which of the following is the correct name of the MnO$_{2}$? A) Manganese oxide. B) Manganese(II) oxide. C) Manganese (IV) oxide. D) Manganese dioxide. Show Answer Correct Answer: C) Manganese (IV) oxide. 44. Which statement correctly describes the 2 electrodes? A) The anode is negative and the cathode is positive. B) The anode and cathode are both positive. C) The anode is positive and the cathode is negative. D) The anode and cathode are both negative. Show Answer Correct Answer: C) The anode is positive and the cathode is negative. 45. A compound in which O has an oxidation number of +2 is A) H$_{2}$O$_{2}$. B) H$_{2}$O. C) OF$_{2}$. D) O$_{2}$F$_{2}$. Show Answer Correct Answer: C) OF$_{2}$. 46. Mg + PbCl2 $\rightarrow$ MgCl2 + Pb. Which statement correctly describes the oxidation and reduction that occur? A) Mg is oxidized and Cl-is reduced. B) Mg is oxidized and Pb+2 is reduced. C) Mg is reduced and Cl-is oxidized. D) Mg is reduced and Pb+2 is oxidized. Show Answer Correct Answer: B) Mg is oxidized and Pb+2 is reduced. 47. Which of these chemical substances can be used as oxidising agent A) Iron (II) sulphate. B) Zinc. C) Bromine water. D) Potassium iodide. Show Answer Correct Answer: C) Bromine water. 48. Determine the oxidation number of each element in H$_{2}$AsO$_{4}$ A) H:+1, As:+6, O:-2. B) H:+1, As:-6, O:-8. C) H:+2, As:-2, O:-2. D) H:+2, As:+6, O:-8. Show Answer Correct Answer: A) H:+1, As:+6, O:-2. 49. How many electrons are being accepted by fluorine in following reaction? F$_{2 }$ $\rightarrow$ 2F$^{-}$ A) 2. B) 4. C) 3. D) 1. Show Answer Correct Answer: A) 2. 50. In the reaction 2Mg$_{(s)}$ + O$_{2(g)}$ $\rightarrow$ 2MgO$_{(s)}$, which is the oxidant? A) Mg$_{(s)}$. B) O2$_{(g)}$. C) MgO$_{(s)}$. D) None of the above. Show Answer Correct Answer: B) O2$_{(g)}$. 51. What is oxidation number of Fe in FeBr? A) -2. B) 0. C) +1. D) +2. Show Answer Correct Answer: C) +1. 52. In a redox reaction, the species reduced A) Gains electrons and is the oxidizing agent. B) Loses electrons and is the oxidizing agent. C) Loses electrons and is the reducing agent. D) Gains electrons and is the reducing agent. Show Answer Correct Answer: A) Gains electrons and is the oxidizing agent. 53. In the reaction Zn + H$_{2}$O $\rightarrow$ ZnO$_{2}$ + H$_{2, }$Identify the reducing agent. A) Zinc. B) Hydrogen. C) Oxygen. D) None. Show Answer Correct Answer: A) Zinc. 54. In the reaction Zn + H2O $\rightarrow$ ZnO + H2, which substance is oxidized? A) Water (H2O). B) Zinc Oxide (ZnO). C) Hydrogen (H2). D) Zinc (Zn). Show Answer Correct Answer: D) Zinc (Zn). 55. What is the oxidation state of chromium in K2Cr2O7? A) +2. B) +4. C) +3. D) +6. Show Answer Correct Answer: D) +6. 56. Oxygen usually has an oxidation number of ..... A) +2. B) -2. C) +1. D) -1. Show Answer Correct Answer: B) -2. 57. How do you balance the redox reaction of Cl2 with I-in acidic solution? A) Cl2 + I-$\rightarrow$ Cl-+ I2. B) Cl2 + 4I-+ 4H+ $\rightarrow$ 2Cl-+ 2I2 + 2H2O. C) Cl2 + 2I-+ H2O $\rightarrow$ 2Cl-+ I2 + 2H+. D) Cl2 + 2I-+ 2H+ $\rightarrow$ 2Cl-+ I2 + H2O. Show Answer Correct Answer: D) Cl2 + 2I-+ 2H+ $\rightarrow$ 2Cl-+ I2 + H2O. 58. What is the balanced equation for the reaction of MnO4-with I-in acidic solution? A) 8H+ + MnO4-+ 5I-$\rightarrow$ Mn2+ + 4H2O + 5I2. B) 2H+ + MnO4-+ 3I-$\rightarrow$ Mn2+ + 2H2O + 3I2. C) 6H+ + MnO4-+ 4I-$\rightarrow$ Mn2+ + 3H2O + 4I2. D) 4H+ + MnO4-+ 2I-$\rightarrow$ Mn2+ + 2H2O + 2I2. Show Answer Correct Answer: A) 8H+ + MnO4-+ 5I-$\rightarrow$ Mn2+ + 4H2O + 5I2. 59. Which of the following cannot act as oxidizing agent? A) KMnO$_{4}$. B) O$_{2}$. C) I$_{2}$. D) K$_{2}$Cr$_{2}$O$_{7}$. Show Answer Correct Answer: C) I$_{2}$. 60. An oxidizing agent will always ..... A) Increase in oxidation number. B) Increase in mass. C) Lose electrons. D) Be reduced. Show Answer Correct Answer: D) Be reduced. ← PreviousNext →Related QuizzesScience QuizzesClass 11 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books