This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 33 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 33 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does it mean for an element to be reduced? A) The element has reacted with oxygen. B) There are fewer atoms in the product than in the reactant. C) The element is in ion form in solution. D) The element has gained one or more electrons. Show Answer Correct Answer: D) The element has gained one or more electrons. 2. Process that is defined as the gain of electrons. A) Oxidation. B) Redox. C) Reduction. D) Reducing agent. Show Answer Correct Answer: C) Reduction. 3. Iodate ion, IO$_{3}$$^{-}$, is an oxidising agent. The half-equation for the reaction isIO$_{3}$$^{-}$(aq) + 6H$^{+}$(aq) +?e$^{-}$ $\rightarrow$ I$^{+}$(aq) + 3H$_{2}$O(l)The value of? in this equation is A) 3. B) 4. C) 5. D) 6. Show Answer Correct Answer: B) 4. 4. What is happening to the chemical in bold?Aluminium + chromium oxide $\rightarrow$ aluminium oxide + chromium A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduction. 5. Which substance is an oxidising agent? A) Bromine water. B) Magnesium powder. C) Iron(II) chloride solution. D) Potassium iodide solution. Show Answer Correct Answer: A) Bromine water. 6. What is happening to the chemical in bold?Nickel + oxygen $\rightarrow$ nickel oxide A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: A) Oxidation. 7. Which of the following is an example of a synthesis reaction: A) 2 H$_{2}$O $\rightarrow$ 2 H$_{2}$ + O$_{2 }$. B) 2 Na + Cl$_{2}$ $\rightarrow$ 2 NaCl. C) CH$_{4}$ + 2 O$_{2}$ $\rightarrow$ 2 H$_{2}$O + CO$_{2}$. D) 2 HCl + Zn $\rightarrow$ ZnCl$_{2 }$+ H$_{2}$. Show Answer Correct Answer: B) 2 Na + Cl$_{2}$ $\rightarrow$ 2 NaCl. 8. What type of reaction is this:C$_{2}$H$_{2 }$becomes C$_{2}$H$_{6}$ A) Reduction. B) Oxidation. C) Neither. D) Combustion. Show Answer Correct Answer: A) Reduction. 9. What is happening to the chemical in bold?Aluminium oxide $\rightarrow$ aluminium + oxygen A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduction. 10. Choose all the processes that are redox reactions. A) Fractional distillation of liquid mixtures. B) Sublimation of iodine crystals. C) Rusting of iron, forming rust, which is hydrated iron(III) oxide. D) Melting of ice. Show Answer Correct Answer: C) Rusting of iron, forming rust, which is hydrated iron(III) oxide. 11. Al (s) + FeSO$_{4}$ (aq) $\rightarrow$ Al$_{2}$(SO$_{4}$)$_{3}$ (aq) + Fe (s)Which statements are true about this reaction?I. Al (s) reduces Fe$^{2+}$ (aq)II. Al (s) is the oxidizing agent.III. FeSO$_{4}$ is the reducing agent. A) I and II only. B) I and III only. C) II and III only. D) I, II and III. Show Answer Correct Answer: B) I and III only. 12. What is the oxidation number of Cl in HClO4? A) +1. B) +3. C) +5. D) +7. Show Answer Correct Answer: D) +7. 13. Which of the following elements is the strongest reducing agent? A) Florine. B) Iron. C) Zinc. D) Bromine. Show Answer Correct Answer: A) Florine. 14. Which of following is correct about given reaction:-Cl2 + H2S $\rightarrow$ S + 2HCl A) Cl2 is oxidising agent in the reaction. B) Cl2 undergo oxidation. C) H2S is oxidising agent. D) H2S undergo reduction. Show Answer Correct Answer: A) Cl2 is oxidising agent in the reaction. 15. Which one of the following metals reacts most vigorously with cold water? A) Sodium. B) Magnesium. C) Copper. D) Zinc. Show Answer Correct Answer: A) Sodium. 16. (a) Zn2+(aq) + 2e-$\rightarrow$ Zn(s)-0.76(b) Cr3+(aq) + 3e-$\rightarrow$ Cr(s)-0.74 (c) Fe2+(aq) + 2e-$\rightarrow$ Fe(s)-0.41correct decreasing order of reducing agents is A) A>b>c. B) B>a>c. C) C>a>b. D) C>b>a. Show Answer Correct Answer: A) A>b>c. 17. What is the oxidation number of oxygen in H$_{2}$O? A) 0. B) +1. C) +2. D) -2. Show Answer Correct Answer: D) -2. 18. What is added to balance a half reaction under acidic conditions? A) CO2 and water. B) Na+ and water. C) OH-and water. D) H+ and water. Show Answer Correct Answer: D) H+ and water. 19. What happens in an oxidation? A) An element gains one or more electrons. B) A compound breaks up into ions. C) An element loses one or more electrons. D) Two compounds trade partners. Show Answer Correct Answer: C) An element loses one or more electrons. 20. Which of the following changed to a metal atom happens when it becomes an ion? A) Gains electrons and is oxidized. B) Gains electrons and is reduced. C) Loses electrons and is oxidized. D) Loses electrons and is reduced. Show Answer Correct Answer: C) Loses electrons and is oxidized. 21. What is the reducing agent here:N$_{2}$ + 3H$_{2}$ $\rightarrow$ 2NH$_{3}$ A) N$_{2}$. B) H$_{2 }$. C) NH$_{3}$. D) 2NH$_{3}$. Show Answer Correct Answer: B) H$_{2 }$. 22. Choose the oxidising agent in this reaction.Cu + 4HNO$_{3}$ $\rightarrow$ Cu(NO$_{3}$)$_{2}$ + 2H$_{2}$O + 2NO$_{2}$ A) Cu. B) HNO$_{3}$. C) Cu(NO$_{3}$)$_{2}$. D) NO$_{2}$. Show Answer Correct Answer: B) HNO$_{3}$. 23. When chlorine reacts with sodium to form sodium chloride, the chlorine is acting as A) A base. B) An acid. C) A reducing agent. D) An oxidizing agent. Show Answer Correct Answer: D) An oxidizing agent. 24. What type of chemical reaction is this?Al(OH)$_{3}$ $\rightarrow$ Al$_{2}$O$_{3}$ + H$_{2}$O A) Decomposition. B) Combustion. C) Synthesis. D) Single Replacement. Show Answer Correct Answer: A) Decomposition. 25. Oxidation is the ..... A) Gain of electrons. B) Gain of ions. C) Loss of oxygen. D) Gain of oxygen. Show Answer Correct Answer: D) Gain of oxygen. ← 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