This quiz works best with JavaScript enabled. Home > Class 11 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the oxidation state of free elements? A) Three. B) Zero. C) One. D) Two. Show Answer Correct Answer: B) Zero. 2. Is Cl$_{2}$ an oxidizing agent or reducing agent? A) Oxidizing agent. B) Reducing agent. C) Neither. D) Both. Show Answer Correct Answer: A) Oxidizing agent. 3. Oxidation number of H in NaH: A) 0. B) +1. C) -1. D) +2. Show Answer Correct Answer: C) -1. 4. What is the oxidation number of Mg in MgCl$_{2 }$(Magnesium Chloride)? A) +1. B) +2. C) -1. D) -2. Show Answer Correct Answer: B) +2. 5. Which element is getting reduced?4Fe+ 3O$_{2}$$\rightarrow$2Fe$_{2}$O$_{3}$ A) O. B) Fe. C) Both. D) None. Show Answer Correct Answer: A) O. 6. Which particles DOES NOT have reducing power? A) Chloride ion. B) Hydrogen ion. C) Chlorine water. D) Hydrogen gas. Show Answer Correct Answer: B) Hydrogen ion. 7. ..... is the loss of electrons. A) Oxidation. B) Reduction. C) Redox. D) All chemical reactions. Show Answer Correct Answer: A) Oxidation. 8. Identify the type of redox reaction:Cl$_{2}$ (g) + 2 OH$^{-}$ (aq) $\rightarrow$ ClO$^{-}$ (aq) + Cl$^{-}$$_{ }$ (aq) + H$_{2}$O (l) A) Decomposition. B) Combination. C) Displacement. D) Disproportionation. Show Answer Correct Answer: D) Disproportionation. 9. What happens to the oxidation state of an element when it is oxidized? A) It decreases. B) It increases. C) It remains the same. D) It becomes negative. Show Answer Correct Answer: B) It increases. 10. What substance is oxidized in the following reaction?4Fe + 3O$_{2}$ $\rightarrow$ 2Fe$_{2}$O$_{3}$ A) Iron. B) Fluorine. C) Oxygen. D) None of the above. Show Answer Correct Answer: A) Iron. 11. What happens to the oxidation number of an element during reduction? A) The oxidation number increases. B) The oxidation number remains the same. C) The oxidation number decreases. D) The oxidation number fluctuates. Show Answer Correct Answer: C) The oxidation number decreases. 12. What is a voltmeter? A) The liquid part of the electrochemical cell. B) The metal part of the electrochemical cell. C) The part that measures the voltage in an electrochemical cell. D) None of the above. Show Answer Correct Answer: C) The part that measures the voltage in an electrochemical cell. 13. What is reduction in redox reactions? A) Losing electrons. B) Sharing electrons. C) Gaining electrons. D) None of the above. Show Answer Correct Answer: C) Gaining electrons. 14. Identify the reducing agent in the following reaction.H$_{2}$S + 2 FeCl$_{3}$ $\rightarrow$ 2 FeCl$_{2}$ + 2 HCl + S A) H$_{2}$S. B) FeCl$_{3}$. C) FeCl$_{2}$. D) S. Show Answer Correct Answer: A) H$_{2}$S. 15. Oxidation-reduction reactions occur because of the competition between particles for ..... A) Protons. B) Neutrons. C) Electrons. D) Absolutely-not-rons. Show Answer Correct Answer: C) Electrons. 16. Reduction reaction occurs when a substance gain electrons A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 17. In the reaction @@ext\{Zn\} + ext\{CuSO\} ..... 4 ightarrow ext\{ZnSO\} ..... 4 + ext\{Cu\}@@, which element is oxidized? A) Zn. B) Cu. C) S. D) O. Show Answer Correct Answer: A) Zn. 18. In the Haber process, what happens to nitrogen's oxidation state? A) It increases, indicating oxidation. B) It decreases, indicating reduction. C) It alternates between increasing and decreasing. D) It remains the same. Show Answer Correct Answer: B) It decreases, indicating reduction. 19. What is oxidation number of H in H$_{2}$O? A) 0. B) -2. C) -1. D) +1. Show Answer Correct Answer: D) +1. 20. Gain of electrons is ..... A) Reduction. B) Oxidation. C) Neither. D) Neutralization. Show Answer Correct Answer: A) Reduction. 21. Anions get discharged by ..... electrons at the ..... A) Gaining, cathode. B) Losing, anode. C) Gaining, anode. D) Losing, cathode. Show Answer Correct Answer: B) Losing, anode. 22. Balance the following reaction in acidic solutionI$^{-}$ + HNO$_{2}$ $\rightarrow$ NO + I$_{2}$ A) 2I$^{-}$ + HNO$_{2}$ + H$_{2}$O + 5e$^{-}$ $\rightarrow$ NO$_{2}$ + I$_{2}$ + 3H$^{+}$. B) I$^{-}$ + HNO$_{2}$ + H$_{2}$O + 5e$^{-}$ $\rightarrow$ NO$_{2}$ + I$_{2}$ + 3H$^{+}$. C) 2I$^{-}$ + HNO$_{2}$ + H$_{2}$O + 4e$^{-}$ $\rightarrow$ NO + I$_{2}$ + 3H$^{+}$. D) 2I$^{-}$ + HNO$_{2}$ + H$_{2}$O + 5e$^{-}$ $\rightarrow$ NO + I$_{2}$ + 3H$^{+}$. Show Answer Correct Answer: D) 2I$^{-}$ + HNO$_{2}$ + H$_{2}$O + 5e$^{-}$ $\rightarrow$ NO + I$_{2}$ + 3H$^{+}$. 23. Which of the following is not a step for balancing redox reactions in acidic solutions? A) Balance elements other than H and O. B) Balance hydrogen with H$^{+}$. C) Balance charge with electrons. D) Balance oxygen with O$^{2-}$. Show Answer Correct Answer: D) Balance oxygen with O$^{2-}$. 24. What is oxidation number of Fe in FeO? A) +2. B) -2. C) 0. D) +1. Show Answer Correct Answer: A) +2. 25. Which of the following reactions is an example of a disproportionation reaction? A) 2Na + Cl2 $\rightarrow$ 2NaCl. B) Zn + Cu2+ $\rightarrow$ Zn2+ + Cu. C) 2H2O2 $\rightarrow$ 2H2O + O2. D) C + O2 $\rightarrow$ CO2. Show Answer Correct Answer: C) 2H2O2 $\rightarrow$ 2H2O + O2. ← 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 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books