This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which half-reaction shows conservation of charge? A) Cu + e$^{-}$ $\rightarrow$ Cu$^{+}$. B) Cu$^{+}$ $\rightarrow$ Cu + e$^{-}$. C) Cu$^{2+}$ + 2e$^{-}$ $\rightarrow$ Cu. D) Cu$^{2+}$ $\rightarrow$ Cu + 2e$^{-}$. Show Answer Correct Answer: C) Cu$^{2+}$ + 2e$^{-}$ $\rightarrow$ Cu. 2. In the reaction @@ext\{Fe\} + ext\{CuSO\} ..... 4 ightarrow ext\{FeSO\} ..... 4 + ext\{Cu\}@@, which element is reduced? A) Iron (Fe). B) Copper (Cu). C) Sulfur (S). D) Oxygen (O). Show Answer Correct Answer: B) Copper (Cu). 3. Aluminium reacts with iron (III) oxide as shown. iron(III) oxide + aluminium $\rightarrow$ iron + aluminium oxide Which statement about this reaction is correct? A) Aluminium is oxidised. B) Aluminium oxide is reduced. C) Iron (III) oxide is reduced. D) Iron is oxidised. Show Answer Correct Answer: A) Aluminium is oxidised. 4. In a redox reaction, what is the substance that gets reduced called? A) Catalyst. B) Oxidizing agent. C) Electrolyte. D) Reducing agent. Show Answer Correct Answer: D) Reducing agent. 5. The standard cell potential for the voltaic cell based on the reaction below is ..... V. 2 Cr (s) + 3 Fe$^{2+ }$(aq) $\rightarrow$ 3 Fe (s) + 2 Cr$^{3+ }$(aq) A) +0.83. B) +0.30. C) +2.80. D) +3.10. E) -0.16. Show Answer Correct Answer: B) +0.30. 6. What is an example of an industrial application of redox chemistry? A) The Haber process. B) Distillation. C) Filtration. D) Crystallization. Show Answer Correct Answer: A) The Haber process. 7. What is the oxidation number of oxygen in water? A) -1. B) -2. C) 0. D) +1. E) +2. Show Answer Correct Answer: B) -2. 8. What is the purpose of electrolysis? A) To increase temperature. B) To create new compounds. C) To break down compounds. D) To combine elements. Show Answer Correct Answer: C) To break down compounds. 9. How can you balance a redox reaction using the half-reaction method? A) Use the half-reaction method to balance redox reactions. B) Use the oxidation state method to balance redox reactions. C) Combine all reactants and products without separating them. D) Ignore the charges and balance only the number of atoms. Show Answer Correct Answer: A) Use the half-reaction method to balance redox reactions. 10. Assertion:Fe reacts with HCl to produce H$_{2}$.Reason:Fe is better reducing agent than H$_{2}$. A) Both assertion and reason are true and the reason is the correct explanation of asserton. B) Both assertion and reason are true but the reason is not the correct explanation of asserton. C) Both assertion and reason are false. D) Assertion is true and reason is false. Show Answer Correct Answer: A) Both assertion and reason are true and the reason is the correct explanation of asserton. 11. This electrode loses mass A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 12. Define oxidation in terms of electron transfer. A) Oxidation is the process in which an atom, ion, or molecule gains electrons. B) Oxidation is the process in which an atom, ion, or molecule loses electrons. C) Oxidation is the process of combining with oxygen. D) Oxidation is the process of breaking down molecules. Show Answer Correct Answer: B) Oxidation is the process in which an atom, ion, or molecule loses electrons. 13. In which of the following compounds, oxygen has the highest oxidation state and in which one, the lowest oxidation state-OF$_{2}$, H$_{2}$O$_{2}$, KO$_{2}$, O$_{2}$F$_{2}$ A) Highest-KO$_{2}$, Lowest-H$_{2}$O$_{2}$. B) Highest-OF$_{2}$, Lowest-H$_{2}$O$_{2}$. C) Highest-OF$_{2}$, Lowest-KO$_{2}$. D) Highest-KO$_{2}$, Lowest-H$_{2}$O$_{2}$. Show Answer Correct Answer: C) Highest-OF$_{2}$, Lowest-KO$_{2}$. 14. Half-reactions can be written to represent all A) Double-replacement reactions. B) Neutralization reactions. C) Fission and fusion reactions. D) Oxidation and reduction reactions. Show Answer Correct Answer: D) Oxidation and reduction reactions. 15. Which mnemonic device is commonly used to remember oxidation and reduction? A) PEMDAS. B) OIL RIG. C) HOMES. D) ROY G BIV. Show Answer Correct Answer: B) OIL RIG. 16. What is the oxidation number of Sulfide ion, S$^{2-}$? A) -2. B) -1. C) 0. D) +2. Show Answer Correct Answer: A) -2. 17. Which one of the followings would result in a displacement reaction? A) Iron with magnesium chloride. B) Magnesium with iron chloride. C) Iron with Zinc Sulphate. D) Gold with silver nitrate. Show Answer Correct Answer: B) Magnesium with iron chloride. 18. Which species undergoes a loss of electrons?Fe$_{(s)}$ + Cl$_{2(g)}$$\rightarrow$Fe$^{2+}$$_{(aq)}$$^{ }$+ Cl$^{-}$$_{(aq)}$ A) Fe. B) Fe$^{2+}$. C) Cl$_{2}$. D) Cl$^{-}$. Show Answer Correct Answer: A) Fe. 19. What is the role of oxidation numbers in redox reactions? A) To balance chemical equations. B) None of the above. C) To keep track of electron movement. D) To determine the color of compounds. Show Answer Correct Answer: C) To keep track of electron movement. 20. What are cations and anions in the context of redox reactions? A) Cations are positively charged ions; anions are negatively charged ions. B) Cations are found in the nucleus; anions are found in the electron cloud. C) Cations are negatively charged ions; anions are positively charged ions. D) Cations are neutral particles; anions are charged particles. Show Answer Correct Answer: A) Cations are positively charged ions; anions are negatively charged ions. 21. What does a redox reaction involve? A) Both oxidation and reduction. B) Only reduction. C) Neither oxidation nor reduction. D) Only oxidation. Show Answer Correct Answer: A) Both oxidation and reduction. 22. What is the oxidation number of Fe in FeO? A) +1. B) -1. C) +2. D) -2. Show Answer Correct Answer: C) +2. 23. Which of the following statements refers to an oxidation process? A) Hydrogen is added to ethene. B) Oxygen is removed from carbon dioxide. C) Chlorine accepts electrons. D) Increase in the oxidation number of magnesium metal. Show Answer Correct Answer: D) Increase in the oxidation number of magnesium metal. 24. What is the role of an oxidising agent in a redox reaction? A) It donates electrons. B) It accepts electrons. C) It donates protons. D) It accepts protons. Show Answer Correct Answer: B) It accepts electrons. 25. In the reaction A) Hydrogen ( $\text{H}_2$. B) Oxygen ( $\text{O}_2$. C) Water ( $\text{H}_2\text{O}$. D) None. Show Answer Correct Answer: B) Oxygen ( $\text{O}_2$. ← 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 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