This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 26 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. KMnO4 + 4KOH $\rightarrow$ 4K$_{2}$MnO4 + 2H$_{2}$O + O$_{2}$change in oxidation number of Mn? A) 1. B) 7. C) 6. D) 2. Show Answer Correct Answer: A) 1. 2. In a redox reaction, the reducing agent will A) Lose an electron and be reduced. B) Lose an electron and be oxidized. C) Gain an electron and be reduced. D) Gain an electron and be oxidized. Show Answer Correct Answer: B) Lose an electron and be oxidized. 3. How do you determine the oxidation states of elements in a compound? A) Ignore the overall charge of the compound. B) Oxidation states are always positive numbers. C) Use only the periodic table to assign states. D) Assign oxidation states based on known rules and balance with the overall charge. Show Answer Correct Answer: D) Assign oxidation states based on known rules and balance with the overall charge. 4. The reduction process involves A) Increase in oxidation number. B) Decrease in oxidation number. C) No change in oxidation number. D) Sometimes increase and sometimes decrease in oxidation number. Show Answer Correct Answer: B) Decrease in oxidation number. 5. In the electrolysis process of water ..... A) OH$^{-}$ ions are reduced. B) H$^{+ }$ions are oxidized. C) H$^{+}$ ions are reducing agent. D) Oxygen gas is collected at anode. Show Answer Correct Answer: D) Oxygen gas is collected at anode. 6. S in HSO$_{4}$$^{-}$? A) +5. B) -6. C) +6. D) +2. Show Answer Correct Answer: C) +6. 7. Which reaction shows the smallest change in the oxidation state of nitrogen? A) N$_{2}$(g) + 3H$_{2}$(g) $\rightarrow$ 2NH$_{3}$(g). B) 2NH$_{3}$(g) + 3CuO(s)$\rightarrow$ N$_{2}$(g) + 3Cu(s) + 3H$_{2}$O(l)). C) 2NO(g) + O$_{2}$(g) $\rightarrow$ 2NO$_{2}$ (g). D) 4NO$_{2}$(g) + O$_{2}$(g) + 2H$_{2}$O(l) $\rightarrow$ 4HNO$_{3}$(l). Show Answer Correct Answer: D) 4NO$_{2}$(g) + O$_{2}$(g) + 2H$_{2}$O(l) $\rightarrow$ 4HNO$_{3}$(l). 8. When a gas changes iron(III) oxide to iron(II) oxide, the gas is A) A combustible gas. B) A reducing agent. C) An inert gas. D) An oxidising agent. Show Answer Correct Answer: B) A reducing agent. 9. What are some common examples of redox reactions in everyday life? A) Common examples of redox reactions include combustion of fuels, cellular respiration, rusting of iron, photosynthesis, and batteries generating electricity. B) Boiling water. C) Melting of ice. D) Photosynthesis in animals. Show Answer Correct Answer: A) Common examples of redox reactions include combustion of fuels, cellular respiration, rusting of iron, photosynthesis, and batteries generating electricity. 10. Bordo mix that is used in agriculture cannot be held in an iron container because iron reacts with the copper (II) sulphate. In the reaction, iron A) Is an oxidising agent. B) Is a reducing agent. C) Has a decrease in oxidation number. D) Is reduced. Show Answer Correct Answer: B) Is a reducing agent. 11. What is the oxidation state of Cl in HClO$_{3}$? A) +5. B) -6. C) +6. D) -1. Show Answer Correct Answer: A) +5. 12. The sum of all oxidation numbers in a neutral compound is ..... A) 0. B) 1. C) -1. D) Depends on the compound. Show Answer Correct Answer: A) 0. 13. What is the species that lose electrons in a redox reaction? A) Oxidizing agent. B) Reducing agent. C) Is reduced. D) Decreases in oxidation number. Show Answer Correct Answer: B) Reducing agent. 14. Why is potassium nitrate classified as an electrolyte? A) It is a molecular compound. B) It contains a metal. C) It can conduct electricity as a solid. D) It releases ions in an aqueous solution. Show Answer Correct Answer: D) It releases ions in an aqueous solution. 15. What is the role of sulfuric acid in the titration of KMnO4? A) Sulfuric acid acts as an acidifying agent to facilitate the reduction of KMnO4. B) Sulfuric acid is used to increase the volume of the solution. C) Sulfuric acid acts as a catalyst for the reaction. D) Sulfuric acid neutralizes KMnO4 during the titration. Show Answer Correct Answer: A) Sulfuric acid acts as an acidifying agent to facilitate the reduction of KMnO4. 16. Which of the following statements is true for the reaction:@@ext\{2H\} ..... 2ext\{O\} ightarrow ext\{2H\} ..... 2 + ext\{O\} ..... 2@@? A) Hydrogen is oxidized. B) Oxygen is reduced. C) Water is oxidized. D) Water is reduced. Show Answer Correct Answer: C) Water is oxidized. 17. Oxygen always has an oxidation number of ..... A) -1. B) 1. C) 2. D) -2. Show Answer Correct Answer: D) -2. 18. What are the spectator ions in this reaction?CuCl$_{2}$(aq) $_{}$+ NaOH(aq) $\rightarrow$ Cu(OH)$_{2}$(s) + NaCl(aq) A) Cu$^{2+}$ and OH$^{1-}$. B) Na$^{2+}$ and Cl$^{2-}$. C) Na$^{1+}$ and Cl$^{1-}$. D) Na$^{1+}$ and OH$^{1-}$. Show Answer Correct Answer: C) Na$^{1+}$ and Cl$^{1-}$. 19. Which of the Cl species can never undergo disproportionation reaction? A) ClO$^{-}$. B) ClO$^{-2}$. C) ClO$^{-3}$. D) ClO$^{-4}$. Show Answer Correct Answer: D) ClO$^{-4}$. 20. Identify the species reduced in the following reaction.Fe$_{(s)}$ + 2 Ag$^{+}$$_{(aq) }$$\rightarrow$ Fe$^{2+}$$_{(aq)}$ + 2 Ag$_{(s)}$ A) Fe. B) Ag. C) None of these. D) None of the above. Show Answer Correct Answer: B) Ag. 21. A substance that oxidizes another substance by accepting its electrons is called an ..... A) Reducing agent. B) Oxidation number. C) Oxidizing agent. D) None of the above. Show Answer Correct Answer: C) Oxidizing agent. 22. What element is being reduced?I$_{2}$ + H$_{2}$SO$_{3}$ + H$_{2}$O $\rightarrow$ 2 HI + H$_{2}$SO$_{4}$ A) I. B) H. C) S. D) O. Show Answer Correct Answer: A) I. 23. Which of the following half reactions correctly represents a reduction half reaction? A) Fe $\rightarrow$Fe$^{2+ }$+ 2e$^{-}$. B) Pb$^{4+}$ + 2e$^{-}$ $\rightarrow$Pb$^{2+}$. C) 2O$^{-2 }$$\rightarrow$O$_{2}$ + 4e$^{-}$. D) Fe + 3e$^{-}$ $\rightarrow$Fe$^{3+}$. Show Answer Correct Answer: B) Pb$^{4+}$ + 2e$^{-}$ $\rightarrow$Pb$^{2+}$. 24. What particles are transferred in an oxidation-reduction reaction? A) Protons. B) Ions. C) Electrons. D) Atoms. Show Answer Correct Answer: C) Electrons. 25. Why are porous electrodes important in fuel cells? A) To decrease the overall weight of the cell. B) To increase the surface area for reaction, thereby enhancing efficiency. C) To make the cell look aesthetically pleasing. D) To reduce the cost of fuel cell production. Show Answer Correct Answer: B) To increase the surface area for reaction, thereby enhancing efficiency. ← 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