This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 23 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Identify the type of the following redox reaction. CH$_{4}$ + 2O$_{2}$$\rightarrow$CO$_{2}$ + 2H$_{2}$O. A) Displacement. B) Combination. C) Decomposition. D) Disproportionation. Show Answer Correct Answer: A) Displacement. 2. What is the oxidation state of oxygen in most compounds? A) -1. B) +1. C) 0. D) -2. Show Answer Correct Answer: D) -2. 3. How do you determine if a reaction is spontaneous based on redox principles? A) A redox reaction is spontaneous if the reactants are in solid form. B) A redox reaction is spontaneous if the temperature is above 100$^\circ$C. C) A redox reaction is spontaneous if the reaction occurs in a closed container. D) A redox reaction is spontaneous if the standard cell potential (E$^\circ$) is positive. Show Answer Correct Answer: D) A redox reaction is spontaneous if the standard cell potential (E$^\circ$) is positive. 4. What is the oxidation number of chlorine in $ClO_3^-$ A) +1. B) +3. C) +5. D) +7. Show Answer Correct Answer: D) +7. 5. Consider the following REDOX reaction:Cl$_{2}$(g) $\rightarrow$ ClO$^{-}$(aq) + Cl$^{-}$(aq) (basic solution)How many OH$^{-}$ molecules did you add to the reactant side of this reaction when balancing? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 6. What type of reaction is the following? Zn$_{(s)}$ + 2Cu(NO$_{3}$)$_{2(aq) }$$\rightarrow$ 2Cu$_{(s)}$ + Zn(NO$_{3}$)$_{2(aq)}$ A) Double displacement. B) Single displacement. C) Precipitation. D) Neutralization. Show Answer Correct Answer: B) Single displacement. 7. What does it mean if a substance is oxidized? A) It means it has gained electrons and its oxidation state has decreased. B) It means it has lost electrons and its oxidation state has increased. C) It means it has remained unchanged in terms of electrons and oxidation state. D) It means it has combined with oxygen and formed a new compound. Show Answer Correct Answer: B) It means it has lost electrons and its oxidation state has increased. 8. Find oxidation states of sulfur in hydrosulfuric acid H2S A) -3. B) -1. C) -2. D) +2. Show Answer Correct Answer: C) -2. 9. Complete the general equation:Metal + Acid $\rightarrow$ A) Salt + Water. B) Salt + Hydrogen. C) Salt. D) None of the above. Show Answer Correct Answer: B) Salt + Hydrogen. 10. What occurs at the cathode in an electrolytic cell? A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduction. 11. Which of the following unbalanced equations represents oxidation? A) C + H2 $\rightarrow$ CH$_{4}$. B) Fe$^{3+}$ $\rightarrow$ Fe$^{2+}$. C) Cl$_{2}$ $\rightarrow$ 2Cl$^{-}$. D) Zn $\rightarrow$ Zn$^{2+}$. Show Answer Correct Answer: D) Zn $\rightarrow$ Zn$^{2+}$. 12. Give the oxidation numbers of all the elements in the following molecules and ions:ClO2 A) +4, -2. B) -3, -2. C) -2, +2. D) -4, -3. Show Answer Correct Answer: A) +4, -2. 13. Identify the reducing agent in the reaction:Fe2O3 + 3CO $\rightarrow$ 2Fe + 3CO2. A) Fe2O3. B) CO. C) CO2. D) O2. Show Answer Correct Answer: B) CO. 14. Which statement best describes the energy conversion in a fuel cell? A) Mechanical energy to electrical energy. B) Chemical energy to electrical energy. C) Electrical energy to chemical energy. D) Thermal energy to electrical energy. Show Answer Correct Answer: B) Chemical energy to electrical energy. 15. What does the gain of electrons indicate? A) Displacement. B) Precipitation. C) Reduction. D) Oxidation. Show Answer Correct Answer: C) Reduction. 16. Secondary Cells contain ..... A) Constant supply of fuel. B) A reversible reaction when charge is applied. C) Consumable chemicals. D) Electrolysis of water. Show Answer Correct Answer: B) A reversible reaction when charge is applied. 17. How do you balance the redox equation for the reaction of zinc with copper(II) sulfate? A) ZnSO4 + Cu $\rightarrow$ Zn + CuSO4. B) Zn + CuSO4 $\rightarrow$ Cu + ZnSO4. C) Zn + CuSO4 $\rightarrow$ ZnSO4 + Cu. D) Cu + ZnSO4 $\rightarrow$ CuSO4 + Zn. Show Answer Correct Answer: C) Zn + CuSO4 $\rightarrow$ ZnSO4 + Cu. 18. The oxidation number of fluorine is always? A) 0. B) +1. C) +2. D) -1. E) -2. Show Answer Correct Answer: D) -1. 19. 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. 20. Determine the oxidation number of each element in PF$_{4}$$^{+}$ A) P:+5, F:-1. B) P:+4, F:-1. C) P:+5, F:-4. D) P:+4, F:-4. Show Answer Correct Answer: A) P:+5, F:-1. 21. In which of the following compounds the oxidation state of the oxygen atom is not equal to (-2)? A) H$_{2}$O. B) CO$_{2}$. C) H$_{2}$CO$_{3}$. D) H$_{2}$O$_{2}$. Show Answer Correct Answer: D) H$_{2}$O$_{2}$. 22. Using the half-reaction method, how would you balance the reaction of MnO4-with Fe2+ in acidic solution? A) MnO4-+ 4H+ + 2Fe2+ $\rightarrow$ Mn2+ + 2H2O + 2Fe3+. B) MnO4-+ 10H+ + 5Fe2+ $\rightarrow$ Mn2+ + 5H2O + 5Fe3+. 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+. 23. Positive ions (cations) move towards the cathode (-) where they will discharge by ..... A) Breaking apart. B) Losing electrons. C) Clumping together. D) Gaining electrons. Show Answer Correct Answer: D) Gaining electrons. 24. An increase in oxidation number is: A) More acidic. B) Reduction. C) Less basic. D) Oxidation. Show Answer Correct Answer: D) Oxidation. 25. 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) Lead. C) Tin. D) Zinc. Show Answer Correct Answer: D) Zinc. ← 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