This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Provide an example of a redox reaction that occurs in batteries. A) C + O2 $\rightarrow$ CO2. B) Fe + CuSO4 $\rightarrow$ FeSO4 + Cu. C) 2H2 + O2 $\rightarrow$ 2H2O. D) Zn + 2MnO2 $\rightarrow$ ZnO + Mn2O3. Show Answer Correct Answer: D) Zn + 2MnO2 $\rightarrow$ ZnO + Mn2O3. 2. Haematite is reduced to iron in the blast furnace. haematite + carbon monoxide $\rightarrow$ iron +X What is X? A) Carbon. B) Carbon dioxide. C) Hydrogen. D) Oxygen. Show Answer Correct Answer: B) Carbon dioxide. 3. The oxidation number of Fe in [Fe(CN)$_{6}$]$^{-3}$ ion is A) +2. B) +3. C) -2. D) -3. Show Answer Correct Answer: B) +3. 4. What is the role of electrons in chemical bonding? A) They are exchanged in all chemical reactions. B) They prevent atoms from bonding with each other. C) They enable atoms to bond with each other to form molecules. D) They are only involved in covalent bonds. Show Answer Correct Answer: C) They enable atoms to bond with each other to form molecules. 5. Is K an oxidizing agent or reducing agent? A) Oxidizing agent. B) Reducing agent. C) Neither. D) Both. Show Answer Correct Answer: B) Reducing agent. 6. Indicate the oxidation number of phosphorus in each of the following compounds:H3PO2 A) -1. B) +1. C) +2. D) +4. E) +3. Show Answer Correct Answer: B) +1. 7. Which of these lists contains only soluble substances? Don't forget that the halides (family 17) will form precipitates with Ag+, Pb2+ and Hg2+. A) Sodium nitrate, potassium chloride, calcium carbonate. B) Lead nitrate, lead chloride, lead sulfate. C) Calcium nitrate, copper chloride, ammonium phosphate. D) Silver nitrate, barium sulfate, copper carbonate. Show Answer Correct Answer: C) Calcium nitrate, copper chloride, ammonium phosphate. 8. Fill in the blank:A redox reaction involves transfer of ..... from one reactant to another. A) Electrons. B) Neutrons. C) Protons. D) None of the above. Show Answer Correct Answer: A) Electrons. 9. From the list below, which step comes last when you are balancing half-equations? A) Add H2O to balance oxygen. B) Balance elements other that O and H. C) Balance the charge with e-. D) Add H+ to balance hydrogen. Show Answer Correct Answer: C) Balance the charge with e-. 10. What is the role of KMnO4 in redox titrations? A) KMnO4 acts as a reducing agent in redox titrations. B) KMnO4 serves as an oxidizing agent in redox titrations. C) KMnO4 is used to measure pH levels in solutions. D) KMnO4 is a catalyst in redox reactions. Show Answer Correct Answer: B) KMnO4 serves as an oxidizing agent in redox titrations. 11. In the reaction $2Mg + O_2 \rightarrow 2MgO$ A) Magnesium. B) Oxygen. C) Both Magnesium and Oxygen. D) Neither Magnesium nor Oxygen. Show Answer Correct Answer: A) Magnesium. 12. What safety precautions should be taken when conducting redox experiments in the lab? A) Wear PPE, ensure ventilation, know chemical reactivity, have neutralizing agents and spill kits, follow waste disposal procedures. B) Use open flames to heat chemicals. C) Ignore labeling on chemical containers. D) Mix all chemicals without precautions. Show Answer Correct Answer: A) Wear PPE, ensure ventilation, know chemical reactivity, have neutralizing agents and spill kits, follow waste disposal procedures. 13. Zn$_{(s)}$ $\rightarrow$ Zn$^{2+}$ $_{(aq)}$ + 2e$^{-}$ shows what type of redox reaction? A) Oxidation. B) Reduction. C) All the above. D) None of the above. Show Answer Correct Answer: A) Oxidation. 14. Substance that oxidizes another substance by accepting its electrons. A) Reducing agent. B) Oxidation number. C) Combustion. D) Oxidizing agent. Show Answer Correct Answer: D) Oxidizing agent. 15. What is reduction? A) When a chemical species gain hydrogen. B) When a chemical species lose electrons. C) When a chemical species gain electrons. D) When a chemical species lose hydrogen. Show Answer Correct Answer: C) When a chemical species gain electrons. 16. How do half-reactions help in balancing redox equations? A) They make the equations more complex. B) They eliminate the need for coefficients. C) They clarify electron transfer and ensure conservation of charge and mass. D) They simplify the equations. Show Answer Correct Answer: C) They clarify electron transfer and ensure conservation of charge and mass. 17. Which element is getting oxidised?CuSO$_{4}$+Zn$\rightarrow$Cu+ZnSO$_{4}$ A) Cu. B) O. C) S. D) Zn. Show Answer Correct Answer: D) Zn. 18. Which of the following equations is a balanced redox equation? A) $\text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}$. B) $\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$. C) $\text{Na} + \text{Cl}_2 \rightarrow \text{NaCl}$. D) $\text{C} + \text{O}_2 \rightarrow \text{CO}$. Show Answer Correct Answer: B) $\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$. 19. Which substance is used to change iron(III) ion to iron(II) ion? A) Bromine water. B) Potassium iodide solution. C) Potassium dichromate(VI) solution. D) Acidified potassium manganate solution. Show Answer Correct Answer: B) Potassium iodide solution. 20. What is the role of a reducing agent in a redox reaction? A) It donates electrons and gets oxidized. B) It accepts electrons and gets reduced. C) It donates protons and gets oxidized. D) It accepts protons and gets reduced. Show Answer Correct Answer: A) It donates electrons and gets oxidized. 21. How do you ensure that charges are balanced in half equations? A) By adding or removing protons. B) By changing the oxidation state. C) By adding or removing neutrons. D) By adding or removing electrons. Show Answer Correct Answer: D) By adding or removing electrons. 22. What is the standard electrode potential of the hydrogen electrode? A) -0.76 V. B) 1.00 V. C) 0.00 V. D) 0.34 V. Show Answer Correct Answer: C) 0.00 V. 23. Reduction is the ..... of electrons. A) Loss. B) Gain. C) Sharing. D) Transfer. Show Answer Correct Answer: B) Gain. 24. Which of the following equations correctly represents a fuel cell operation? A) $2H_2 + O_2 \rightarrow 2H_2O + energy$. B) $Cu + 2Ag^+ \rightarrow Cu^{2+} + 2Ag$. C) $Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$. D) $2Na + Cl_2 \rightarrow 2NaCl$. Show Answer Correct Answer: A) $2H_2 + O_2 \rightarrow 2H_2O + energy$. 25. Which of the following elements will oxidize most easily? A) Chlorine. B) Aluminium. C) Hydrogen. D) Lithium. Show Answer Correct Answer: D) Lithium. 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