This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Identify the oxidizing agent in a redox reaction. A) The substance that acts as a catalyst in the reaction. B) The substance that gains electrons and is reduced. C) The substance that remains unchanged during the reaction. D) The substance that loses electrons and is oxidized. Show Answer Correct Answer: B) The substance that gains electrons and is reduced. 2. Which substance is reduced in the following reaction? NaOH + Li $\rightarrow$ LiOH + Na A) Li. B) Na. C) O. D) H. Show Answer Correct Answer: B) Na. 3. In the reaction @@ext\{2H\} ..... 2ext\{O\} ..... 2 ightarrow ext\{2H\} ..... 2ext\{O\} + ext\{O\} ..... 2@@, what is the oxidizing agent? A) $\text{H}_2\text{O}_2$. B) $\text{H}_2\text{O}$. C) $\text{O}_2$. D) None of the above. Show Answer Correct Answer: A) $\text{H}_2\text{O}_2$. 4. Given the reaction for the corrosion of aluminum:4 Al + 3 O$_{2}$ $\rightarrow$ 2 Al$_{2}$O$_{3}$Which half-reaction correctly represents the oxidation that occurs? A) Al + 3e-$^{ }$ $\rightarrow$ Al$^{3+}$. B) Al $\rightarrow$ Al$^{3+}$ + 3e$^{-}$. C) O$_{2}$ + 4e$^{-}$ $\rightarrow$ 2 O$^{2-}$. D) O$_{2}$ $\rightarrow$ 2 O$_{2}$-+ 4e$^{-}$. Show Answer Correct Answer: B) Al $\rightarrow$ Al$^{3+}$ + 3e$^{-}$. 5. In the following reaction, which term applies to chlorine?Ca + Cl$_{2}$ $\rightarrow$ CaCl$_{2}$ A) Oxidising agent. B) Reducing agent. C) Spectator ion. D) Accelerator ion. Show Answer Correct Answer: A) Oxidising agent. 6. What is the role of an oxidizing agent? A) It loses electrons. B) It is oxidized in the reaction. C) It is reduced in the reaction. D) It gains electrons. Show Answer Correct Answer: C) It is reduced in the reaction. 7. What is the oxidation state of sulfur in the sulfate ion (SO42-)? A) +10. B) +8. C) +6. D) +4. Show Answer Correct Answer: C) +6. 8. Which change indicates reduction? A) Fe becomes Fe$^{2+}$. B) Fe$^{2+}$ becomes Fe. C) Ag becomes Ag$^{+}$. D) None of the above. Show Answer Correct Answer: B) Fe$^{2+}$ becomes Fe. 9. What is the name of the positive electrode? A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anode. 10. What will be the result of the following:Br$_{2 }$+ NaF $\rightarrow$ A) Bromine will replace Na. B) Na will replace Br. C) Br will replace F. D) No reaction will occur. Show Answer Correct Answer: D) No reaction will occur. 11. What is the oxidation state of a lone element? A) It is always 0. B) It is its most likely oxidation state. C) It is the same as in a compound. D) It is always 1. Show Answer Correct Answer: A) It is always 0. 12. The correct description about redox reaction is A) Oxygen is definitely present. B) The oxidising agent itself carries out oxidation. C) Oxidation takes place before reduction. D) Electron transfer definitely takes place. Show Answer Correct Answer: D) Electron transfer definitely takes place. 13. How do you identify the reducing agent in a redox reaction? A) The reducing agent is the substance that is reduced. B) The reducing agent gains electrons during the reaction. C) The reducing agent is always a metal. D) The reducing agent is the substance that is oxidized. Show Answer Correct Answer: D) The reducing agent is the substance that is oxidized. 14. The basis of redox reactions is the A) Change in oxidation numbers. B) Recombination of atoms in molecules. C) Loss, gain, or bias of electrons. D) Gain or loss of oxygen atom. Show Answer Correct Answer: A) Change in oxidation numbers. 15. What is the IUPAC name and oxidation number of copper element in the compound Cu$_{2}$O? A) Copper(I) oxide; +1. B) Copper(I) oxide; +2. C) Copper(II) oxide; +1. D) Copper(II) oxide; +2. Show Answer Correct Answer: A) Copper(I) oxide; +1. 16. Which process involves the transfer of electrons? A) Double replacement. B) Neutralization. C) Oxidation-reduction. D) Sublimation. Show Answer Correct Answer: C) Oxidation-reduction. 17. Which element undergoes reduction here:N$_{2}$ + 3H$_{2}$ $\rightarrow$ 2NH$_{3}$ A) N$_{2}$. B) H$_{2 }$. C) NH$_{3}$. D) None. Show Answer Correct Answer: A) N$_{2}$. 18. What metal in reactivity series is extracted by electrolysis? A) Iron. B) Lithium. C) Lead. D) Gold. Show Answer Correct Answer: B) Lithium. 19. The process defined as the loss of electrons. A) Oxidation. B) Reduction. C) Redox. D) Oxidizing agnet. Show Answer Correct Answer: A) Oxidation. 20. Cl$_{2}$ + 2e-$\rightarrow$ 2Cl $^{-}$ is an example of: A) A chemical reaction. B) Redox. C) Oxidation. D) Reduction. Show Answer Correct Answer: D) Reduction. 21. An element's oxidation numbers became more negative during a reaction. What happened to that element? A) It was oxidized. B) It was reduced. C) It was both oxidized and reduced. D) It was neither oxidized nor reduced. Show Answer Correct Answer: B) It was reduced. 22. In the reaction $\text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu}$ A) Zinc (Zn). B) Copper (Cu). C) Sulphur (S). D) Oxygen (O). Show Answer Correct Answer: A) Zinc (Zn). 23. Is calcium oxidized or reduced in the following reaction? 2 CaO$\rightarrow$ 2 Ca + O$_{2}$ A) Oxidized. B) Reduced. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduced. 24. Which one of the following is the best oxidizing agent? A) Ca. B) Na. C) O$_{2}$. D) H$_{2}$. E) Li. Show Answer Correct Answer: C) O$_{2}$. 25. Describe the steps involved in balancing a redox reaction using the half-reaction method. A) Identifying only the oxidizing agent. B) The steps involved in balancing a redox reaction using the half-reaction method include identifying half-reactions, balancing atoms and charges, and combining them. C) Combining half-reactions without balancing. D) Ignoring charge balance during the process. Show Answer Correct Answer: B) The steps involved in balancing a redox reaction using the half-reaction method include identifying half-reactions, balancing atoms and charges, and combining them. ← 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 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 10Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books