This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Acidified potassium manganate(VII) is usually used as A) A reducing agent. B) An oxidising agent. C) Both an oxidising and a reducing agent. D) A dehydrating agent. Show Answer Correct Answer: B) An oxidising agent. 2. What element's don't have oxidation numbers? A) Alkali metals. B) Noble gases. C) Halogens. D) Alkaline earth metals. Show Answer Correct Answer: B) Noble gases. 3. What is the oxidation number of oxygen in most compounds? A) -1. B) -2. C) 0. D) +1. Show Answer Correct Answer: B) -2. 4. Which of the following elements will form a cation? A) Arsenic. B) Copper. C) Bromine. D) Fluorine. Show Answer Correct Answer: B) Copper. 5. In electrochemistry, the site where oxidation occurs is called the ..... A) Electrode. B) Cathode. C) Anode. D) Ion. Show Answer Correct Answer: C) Anode. 6. Which type of redox reaction is shown below? KClO$_{3}$ $\rightarrow$ KCl + O$_{2}$ (a) A) A. decomposition. B) Synthesis. C) Combustion. D) Single replacement. Show Answer Correct Answer: A) A. decomposition. 7. Which metal is the most reactive according to the reactivity series of metals? A) Gold. B) Iron. C) Potassium. D) Copper. Show Answer Correct Answer: C) Potassium. 8. In the reaction 2Mg + O2 $\rightarrow$ 2MgO, what is being oxidized? A) None of the above. B) Magnesium. C) Oxygen. D) Magnesium oxide. Show Answer Correct Answer: B) Magnesium. 9. In the reaction Zn + 2HCl $\rightarrow$ ZnCl$_{2}$ + H$_{2}$which element, if any, is oxidized? A) Zinc. B) Hydrogen. C) Chlorine. D) None. Show Answer Correct Answer: A) Zinc. 10. What is the colour change of acidified KMnO$_{4}$(aq) solution when serving as oxidizing agent? A) From green to orange. B) From orange to green. C) From purple to blue. D) From colourless to purple. Show Answer Correct Answer: D) From colourless to purple. 11. Explain the significance of oxidation states in redox reactions. A) Oxidation states are used to measure temperature changes in reactions. B) Oxidation states are irrelevant in redox reactions. C) Oxidation states only apply to acids and bases. D) Oxidation states are significant in redox reactions as they help identify electron transfer, determine which species are oxidized or reduced, and facilitate the balancing of redox equations. Show Answer Correct Answer: D) Oxidation states are significant in redox reactions as they help identify electron transfer, determine which species are oxidized or reduced, and facilitate the balancing of redox equations. 12. What is the fundamental mechanism behind redox reactions? A) Proton transfer. B) Neutron transfer. C) Photon transfer. D) Electron transfer. Show Answer Correct Answer: D) Electron transfer. 13. What is the cathode in a galvanic cell? A) The electrode where oxidation occurs. B) The electrode where reduction occurs. C) The electrode that attracts cations. D) The electrode that attracts anions. Show Answer Correct Answer: B) The electrode where reduction occurs. 14. Which statement is true:Mg $\rightarrow$ Mg$^{2+}$ + 2e$^{-}$ A) Mg gains 2 electrons. B) Mg$^{2+}$ loses 2 electron. C) Mg loses 1 electron. D) Mg loses 2 electrons. Show Answer Correct Answer: B) Mg$^{2+}$ loses 2 electron. 15. ..... is reduced in the following reaction:Cr$_{2}$O$_{7}$$^{2-}$ + 6 S$_{2}$O$_{3}$$^{2-}$+ 14 H$^{+ }$$\rightarrow$ 2 Cr$^{3+ }$+ 3 S$_{4}$O$_{6}$$^{2-}$+ 7 H$_{2}$O A) S$_{4}$O$_{6}$$^{2-}$. B) Cr$^{6+}$. C) H$^{+}$. D) S$^{2+}$. E) O$^{2-}$. Show Answer Correct Answer: B) Cr$^{6+}$. 16. Which element is oxidized?H$_{2}$S + Cl$_{2}$ $\rightarrow$ 2HCl + S A) H. B) S. C) Cl. D) Not a redox reaction. Show Answer Correct Answer: B) S. 17. In the reaction $Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$ A) Zinc. B) Copper. C) Sulfur. D) Oxygen. Show Answer Correct Answer: B) Copper. 18. What is the oxidation state of Cl in ClO$^{-}$? A) 0. B) +1. C) -1. D) +2. Show Answer Correct Answer: B) +1. 19. In this equation, CuCl$_{2}$ $_{}$+ NaOH $\rightarrow$ Cu(OH)$_{2}$ + NaClWhich product is insoluble? A) Copper(II) hydroxide. B) Sodium chloride. C) Sodium hydroxide. D) Copper(II) chloride. Show Answer Correct Answer: A) Copper(II) hydroxide. 20. Which of the following methods is commonly used for corrosion prevention? A) Electroplating. B) Combustion. C) Distillation. D) Fermentation. Show Answer Correct Answer: A) Electroplating. 21. ..... is reduced in the following reaction:Cr$_{2}$O$_{7}$$^{2-}$ + 6 S$_{2}$O$_{3}$$^{2-}$ + 14H$^{+ }$ > 2Cr$^{3+}$ + 3S$_{4}$O$_{6}$$^{2-}$ + 7H$_{2}$O A) Cr$_{2}$O$_{7}$$^{2-}$. B) S$_{2}$O$_{3}$$^{2-}$. C) H$^{+}$. D) S$_{4}$O$_{6}$$^{2-}$. Show Answer Correct Answer: A) Cr$_{2}$O$_{7}$$^{2-}$. 22. Which reactant is oxidized in the following reaction:Ba(s) + O$_{2}$(g) $\rightarrow$ BaO(s) A) BaO. B) O$_{2}$. C) Ba. D) None of the above. Show Answer Correct Answer: C) Ba. 23. How many electrons are transferred in the reaction below?3 Mg + 2 AlCl$_{3}$ $\rightarrow$ 3 MgCl$_{2}$ + 2 Al A) 2 electrons. B) 3 electrons. C) 6 electrons. D) 10 electrons. Show Answer Correct Answer: C) 6 electrons. 24. In a galvanic cell, which electrode is the anode? A) The electrode with the higher potential. B) The electrode connected to the salt bridge. C) The electrode where oxidation occurs. D) The electrode where reduction occurs. Show Answer Correct Answer: C) The electrode where oxidation occurs. 25. What is the name given to the solution that is being electrolysed? A) Salt solution. B) Electric solution. C) Mineral solution. D) Electrolyte. Show Answer Correct Answer: D) Electrolyte. ← 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