This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following reaction is not a redox reaction? A) Electrolysis. B) Rusting. C) Single displacement. D) Thermal decomposition. Show Answer Correct Answer: D) Thermal decomposition. 2. Oxidation state of any free element is always ..... A) 0. B) 1. C) 2. D) 3. Show Answer Correct Answer: A) 0. 3. Metals are extracted from their ores.What is the name of the ores that contain Fe$_{2}$O$_{3}$ as the main mineral? A) Cassiterite. B) Hematite. C) Magnetite. D) Malachite. Show Answer Correct Answer: B) Hematite. 4. Gaining hydrogen is an example of ..... A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduction. 5. How do fuel cells differ from galvanic cells? A) Fuel cells require a continuous supply of reactants. B) Galvanic cells convert chemical energy into electrical energy more efficiently. C) Fuel cells do not involve redox reactions. D) Galvanic cells require an external circuit to operate. Show Answer Correct Answer: A) Fuel cells require a continuous supply of reactants. 6. In the reaction Zn + Cu2+ $\rightarrow$ Zn2+ + Cu, which species is reduced? A) Zinc. B) None of the above. C) Copper ion. D) Copper metal. Show Answer Correct Answer: C) Copper ion. 7. In the reaction @@ext\{Zn\} + ext\{CuSO\} ..... 4 ightarrow ext\{ZnSO\} ..... 4 + ext\{Cu\}@@, which element is reduced? A) Zinc (Zn). B) Copper (Cu). C) Sulfur (S). D) Oxygen (O). Show Answer Correct Answer: B) Copper (Cu). 8. What is the oxidizing agent of this reaction?(The reactant that is reduced.)3Mg + N$_{2}$$\rightarrow$ Mg$_{3}$N$_{2}$ A) Mg. B) N$_{2}$. C) Mg$_{3}$N$_{2}$. D) MgN. Show Answer Correct Answer: B) N$_{2}$. 9. What is the role of an oxidizing agent in a redox reaction? A) An oxidizing agent donates electrons and is oxidized in the process. B) An oxidizing agent accepts electrons and is reduced in the process. C) An oxidizing agent increases the temperature of the reaction. D) An oxidizing agent acts as a catalyst and speeds up the reaction. Show Answer Correct Answer: B) An oxidizing agent accepts electrons and is reduced in the process. 10. Which of the following is the correct balanced redox equation for the reaction between $Fe^{2+}$ $MnO_4^-$ A) $5Fe^{2+} + MnO_4^-+ 8H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 4H_2O$. B) $5Fe^{2+} + MnO_4^-+ 4H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 2H_2O$. C) $5Fe^{2+} + MnO_4^-+ 8H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 2H_2O$. D) $5Fe^{2+} + MnO_4^-+ 4H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 4H_2O$. Show Answer Correct Answer: A) $5Fe^{2+} + MnO_4^-+ 8H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 4H_2O$. 11. Identify the oxidation number of nitrogen in NH3. A) -3. B) +1. C) -1. D) +3. Show Answer Correct Answer: A) -3. 12. Substance that reduces another substance by losing electrons. A) Reducing agent. B) Conbustion. C) Oxidation number. D) Oxidizing agent. Show Answer Correct Answer: A) Reducing agent. 13. What is the oxidation number of sulfur in H$_{2}$SO$_{4}$? A) 0. B) +1. C) +4. D) +6. Show Answer Correct Answer: D) +6. 14. A half equation is one that ..... A) Only shows half of an equation. B) Shows reduction. C) Shows either reduction or oxidation. D) Shows everything in a redox reaction. Show Answer Correct Answer: C) Shows either reduction or oxidation. 15. In the reaction 2Mg$_{(s)}$ + O$_{2(g)}$ $\rightarrow$ 2MgO$_{(s)}$, which is the reductant? A) Mg$_{(s)}$. B) O$_{2(g)}$. C) MgO$_{(s)}$. D) None of the above. Show Answer Correct Answer: A) Mg$_{(s)}$. 16. H in NaH? A) +1. B) 0. C) -1. D) None of the above. Show Answer Correct Answer: C) -1. 17. Which is a salt? A) Copper oxide. B) Copper sulphate. C) Copper hydroxide. D) Copper. Show Answer Correct Answer: B) Copper sulphate. 18. H2O2$\rightarrow$ H2O +O2 is an example of A) Displacement reaction. B) Combination reaction. C) Decomposition reaction. D) Disproportionation reaction. Show Answer Correct Answer: D) Disproportionation reaction. 19. Loss of electrons is ..... A) Reduction. B) Oxidation. C) Neutralization. D) Double replace. Show Answer Correct Answer: B) Oxidation. 20. A reducing agent causes the other chemical species to undergo reduction, so it will lose electrons because it is oxidised itself. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. In a redox reaction, number of oxygen and hydrogen atoms are balanced by adding ..... A) H$^{+}$. B) OH$^{-}$. C) H$_{2}$O. D) H$_{2}$O$_{2}$. Show Answer Correct Answer: C) H$_{2}$O. 22. Describe the reduction mechanism of chromium in potassium dichromate. A) Chromium is reduced from Cr(IV) to Cr(II) in potassium dichromate. B) Chromium remains in the Cr(VI) state in potassium dichromate. C) Chromium is oxidized from Cr(III) to Cr(VI) in potassium dichromate. D) Chromium is reduced from Cr(VI) to Cr(III) in potassium dichromate. Show Answer Correct Answer: D) Chromium is reduced from Cr(VI) to Cr(III) in potassium dichromate. 23. What is the oxidation number of nitrogen in N$_{2}$? A) -3. B) 0. C) +4. D) -1. Show Answer Correct Answer: B) 0. 24. Balance the following ACIDIC reactions using the half-reaction method.MnO$_{4}$$^{-}$ + H$^{+}$ + C$_{2}$O$_{4}$$^{2-}$ $\rightarrow$ Mn$^{2+}$ + CO$_{2}$Water is a product of this reaction. What is the coefficient of water in the final balanced equation? A) 8. B) 5. C) 2. D) 16. Show Answer Correct Answer: A) 8. 25. The incomplete equation shows a reaction. CuCO$_{3}$ + H$_{2}$SO$_{4}$ $\rightarrow$ products What are the products of this reaction? A) Copper(II) oxide, sulphur dioxide, hydrogen. B) Copper(II) oxide, sulphur dioxide, water. C) Copper(II) sulphate, carbon dioxide, hydrogen. D) Copper(II) sulphate, carbon dioxide, water. Show Answer Correct Answer: D) Copper(II) sulphate, carbon dioxide, water. ← 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