This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Determine the oxidation number of iron in FeCl$_{3}$. A) 0. B) +1. C) +2. D) +3. Show Answer Correct Answer: D) +3. 2. What is oxidation number of P in K$_{3}$PO$_{4}$? A) +1. B) +5. C) -2. D) 0. Show Answer Correct Answer: B) +5. 3. Answer with TRUE or FALSE:For every oxidation in a chemical process, there must be an associated reduction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. Which of these results in the formation of a precipitate? A) AgNO$_{3}$(aq) + NaOH(aq)$\rightarrow$. B) BaNO$_{3}$(aq) + CaCl$_{2}$(aq)$\rightarrow$. C) NaNO$_{3}$(aq) + KOH(aq)$\rightarrow$. D) More than one of these form precipitates. Show Answer Correct Answer: A) AgNO$_{3}$(aq) + NaOH(aq)$\rightarrow$. 5. Which of the following represents reduction? A) C $\rightarrow$ CO. B) N$_{2}$ $\rightarrow$ NH$_{3}$. C) Zn $\rightarrow$ Zn$^{2+}$. D) H$_{2}$ $\rightarrow$ H$_{2}$O. Show Answer Correct Answer: B) N$_{2}$ $\rightarrow$ NH$_{3}$. 6. In the reaction @@ext\{2Fe\} ..... 2ext\{O\} ..... 3 + 3ext\{C\} ightarrow 4ext\{Fe\} + 3ext\{CO\} ..... 2@@, which element is reduced? A) Iron (Fe). B) Carbon (C). C) Oxygen (O). D) None. Show Answer Correct Answer: A) Iron (Fe). 7. What is the oxidation number of hydrogen in most compounds? A) 0. B) -1. C) +1. D) +2. Show Answer Correct Answer: C) +1. 8. What is the oxidation number of chromium in Cr$_{2}$O$_{7}$$^{2-ion?}$ A) +3. B) +14. C) +12. D) +6. E) +7. Show Answer Correct Answer: D) +6. 9. Which element is getting reduced?2Mg+O$_{2}$ ..... 2MgO A) Mg. B) O. C) Both. D) None. Show Answer Correct Answer: B) O. 10. Balance the following redox reaction in acidic solution:$MnO_4^-+ Fe^{2+} \rightarrow Mn^{2+} + Fe^{3+}$ A) $MnO_4^-+ 5Fe^{2+} + 8H^+ \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O$. B) $MnO_4^-+ 3Fe^{2+} + 4H^+ \rightarrow Mn^{2+} + 3Fe^{3+} + 2H_2O$. C) $MnO_4^-+ 2Fe^{2+} + 4H^+ \rightarrow Mn^{2+} + 2Fe^{3+} + 2H_2O$. D) $MnO_4^-+ 4Fe^{2+} + 8H^+ \rightarrow Mn^{2+} + 4Fe^{3+} + 4H_2O$. Show Answer Correct Answer: A) $MnO_4^-+ 5Fe^{2+} + 8H^+ \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O$. 11. Which one of the following conversions is an example of reduction? A) Copper (II) oxide to copper (II) sulfate. B) Copper (II) oxide to copper. C) Hydrochloric acid to chlorine. D) Lead (II) nitrate to lead (II) chloride. Show Answer Correct Answer: B) Copper (II) oxide to copper. 12. When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is A) A reducing agent. B) An oxidizing agent. C) A combustible gas. D) A diffusible gas. Show Answer Correct Answer: A) A reducing agent. 13. The oxidation number of S atom in S$_{2}$O$_{4}$$^{-2}$ is ..... A) +2. B) +3. C) +4. D) +6. Show Answer Correct Answer: B) +3. 14. Which of the following is a correct half-reaction for the reduction of $Cu^{2+}$ $Cu$ A) $Cu^{2+} + 2e^-\rightarrow Cu$. B) $Cu \rightarrow Cu^{2+} + 2e^-$. C) $Cu^{2+} \rightarrow Cu + 2e^-$. D) $Cu + 2e^-\rightarrow Cu^{2+}$. Show Answer Correct Answer: A) $Cu^{2+} + 2e^-\rightarrow Cu$. 15. What happens to Cr$^{3+}$ ion when it is converted to CrO$_{4}$$^{2-}$ A) Oxidation number decreases and it undergoes reduction. B) Oxidation number decreases and it undergoes oxidation. C) Oxidation number increases and it undergoes reduction. D) Oxidation number increases and it undergoes oxidation. Show Answer Correct Answer: D) Oxidation number increases and it undergoes oxidation. 16. The reducing agent is: A) Remains unchanged. B) Oxidized. C) Reduced. D) None of the above. Show Answer Correct Answer: B) Oxidized. 17. How do you determine the oxidation state of an element in a compound? A) By using a set of rules, including the known oxidation states of other elements in the compound. B) By calculating the total charge of the compound and dividing by the number of elements. C) By identifying the element's position in the periodic table and its group number. D) By assuming all elements have a zero oxidation state unless otherwise specified. Show Answer Correct Answer: A) By using a set of rules, including the known oxidation states of other elements in the compound. 18. In a redox reaction, the substance that gains electrons is called the: A) Oxidant. B) Reductant. C) Catalyst. D) Inhibitor. Show Answer Correct Answer: B) Reductant. 19. In which one of the following pairs of substances does the named element have the same oxidation state? A) Chlorine in Cl$_{2}$, and HCl. B) Iron in FeCl$_{2}$ and FeCl$_{3}$. C) Manganese in MnO$_{2}$ and MnCl$_{2}$. D) Sulfur in SO$_{3}$ and Na$_{2}$SO$_{4}$. Show Answer Correct Answer: D) Sulfur in SO$_{3}$ and Na$_{2}$SO$_{4}$. 20. What is the species that gain electrons in a redox reaction? A) Oxidizing agent. B) Reducing agent. C) Is oxidized. D) Increases in oxidation number. Show Answer Correct Answer: A) Oxidizing agent. 21. Oxidation state of chlorine increases from-1 to 0. Hence HCl is ..... agent? A) Redox. B) Oxidizing. C) Reducing. D) Complex. Show Answer Correct Answer: C) Reducing. 22. How do you determine the oxidation number of an element in a compound? A) Assign oxidation numbers based on a set of rules, including the known oxidation states of common elements and the overall charge of the compound. B) Use the periodic table to find the atomic number of the element. C) Calculate the mass of the element in the compound and divide by the total mass. D) Determine the color change of the compound when it reacts with an acid. Show Answer Correct Answer: A) Assign oxidation numbers based on a set of rules, including the known oxidation states of common elements and the overall charge of the compound. 23. What is the significance of balancing redox reactions? A) It helps to increase the reaction rate. B) It ensures that the number of atoms and the charge are conserved in the reaction. C) It allows for the formation of new products. D) It simplifies the reaction mechanism. Show Answer Correct Answer: B) It ensures that the number of atoms and the charge are conserved in the reaction. 24. Total oxidation number of a compound is equal to ..... A) Number of atoms. B) Zero. C) The charge of the high electronegative atom. D) Number of electrons given. Show Answer Correct Answer: B) Zero. 25. What is the reducing agent of this reaction?(The reactant that is oxidized.)2Al$_{(s)}$ + 6H$^{+}$$_{(aq) }$$\rightarrow$ 2Al$^{3+}$$_{ (aq)}$ + 3H$_{2(g)}$ A) H$^{+}$. B) Al$^{3+}$. C) Al. D) H$_{2}$. Show Answer Correct Answer: C) Al. ← 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