This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Iron (II) ions, Fe$^{2+}$ in a solution can be changed to iron (III), Fe$^{3+}$ by adding solution X. What is X? A) Sodium hydroxide. B) Sodium thiosulphate. C) Potassium hexacyanoferrate(II). D) Acidified potassium manganate (VII). Show Answer Correct Answer: D) Acidified potassium manganate (VII). 2. In the reaction 2H2S + O2 $\rightarrow$ 2S + 2H2O, which species is reduced? A) S. B) O2. C) H2S. D) H2O. Show Answer Correct Answer: B) O2. 3. Which of the following is NOT a type of redox reaction? A) Neutralization reactions. B) Displacement reactions. C) Decomposition reactions. D) Combination reactions. Show Answer Correct Answer: A) Neutralization reactions. 4. Net ionic equation A) The ions in a chemical reaction that remain aqueous throughout the entire reaction. B) The chemical equation that represents the ions that are participating in the actual chemistry. The spectator ions are removed from the overall equation to reveal the net ionic equation. C) An insoluble (solid) substance that is formed from two soluble (aqueous) substances. D) Both matter and mass are conserved throughout a chemical reaction. Show Answer Correct Answer: B) The chemical equation that represents the ions that are participating in the actual chemistry. The spectator ions are removed from the overall equation to reveal the net ionic equation. 5. What happens during the corrosion of iron? A) Iron gains oxygen. B) Iron loses oxygen. C) Iron loses electrons. D) Iron gains electrons. Show Answer Correct Answer: A) Iron gains oxygen. 6. What is the meaning of reduction? A) Gain of electron. B) Gain of oxygen. C) Loss of hydrogen. D) Loss of electron. Show Answer Correct Answer: A) Gain of electron. 7. What is the oxidation state of H in H$_{2}$? A) +2. B) +1. C) 0. D) None of the above. Show Answer Correct Answer: C) 0. 8. WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:Balance the following reactions using changing oxidation number method.MnO$_{4}$$^{-}$(aq) + H$^{+}$(aq) + I$^{-}$ (aq) $\rightarrow$ Mn$^{2+}$(aq) + I$_{2}$(s)How many electrons water compound produced in the reaction? A) 10. B) 9. C) 8. D) 7. Show Answer Correct Answer: C) 8. 9. What does the term 'reductant' refer to? A) A substance that gains electrons. B) A substance that loses electrons. C) A substance that is oxidized. D) A substance that is reduced. Show Answer Correct Answer: B) A substance that loses electrons. 10. Which of the following reactions is a redox reaction? A) $H_2 + Cl_2 \rightarrow 2HCl$. B) $NaOH + HCl \rightarrow NaCl + H_2O$. C) $CaCO_3 \rightarrow CaO + CO_2$. D) $AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$. Show Answer Correct Answer: A) $H_2 + Cl_2 \rightarrow 2HCl$. 11. How is the standard electrode potential of a half-cell measured? A) By comparing it to the potential of a standard hydrogen electrode under standard conditions. B) By measuring the amount of gas produced in the reaction. C) By calculating the difference in mass of the electrode before and after the reaction. D) By observing the color change of the solution. Show Answer Correct Answer: A) By comparing it to the potential of a standard hydrogen electrode under standard conditions. 12. Assertion:Sulphur dioxide and chlorine are oth bleaching agents.Reason:Both are reducing agents. 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) Assertion is true and the reason is false. D) Both assertion and reason are false. Show Answer Correct Answer: C) Assertion is true and the reason is false. 13. It contains the element that is reduced. A) Reagent. B) Reactant. C) Oxidant. D) Reductant. Show Answer Correct Answer: C) Oxidant. 14. What is the balanced equation for the reaction of hydrogen peroxide (H2O2) with iodide ions (I-) in basic solution? A) H2O2 + I-$\rightarrow$ I2 + H2O. B) 2 H2O2 + I-$\rightarrow$ I2 + 2 H2O. C) 2 H2O2 + 2 I-$\rightarrow$ I2 + 2 H2O + 2 OH-. D) H2O2 + 2 I-$\rightarrow$ I2 + 2 OH-. Show Answer Correct Answer: C) 2 H2O2 + 2 I-$\rightarrow$ I2 + 2 H2O + 2 OH-. 15. An increase in oxidation number. A) Oxdiation. B) Reduction. C) Redox. D) OIL RIG. Show Answer Correct Answer: A) Oxdiation. 16. In the reaction $\text{2Na} + \text{Cl}_2 \rightarrow 2\text{NaCl}$ A) Sodium (Na). B) Chlorine (Cl). C) Sodium chloride (NaCl). D) None. Show Answer Correct Answer: B) Chlorine (Cl). 17. In redox reactions most nonmetals have tendency to ..... A) Take electrons. B) Give electrons. C) Give protons. D) Oxidize. Show Answer Correct Answer: A) Take electrons. 18. What is oxidation? A) Loss of oxygen. B) Gain of oxygen. C) All the above. D) None of the above. Show Answer Correct Answer: B) Gain of oxygen. 19. Identify the reducing agent in a redox reaction. A) The reducing agent is the substance that remains unchanged. B) The reducing agent is the substance that accepts electrons. C) The reducing agent is the substance that donates electrons. D) The reducing agent is the substance that increases oxidation state. Show Answer Correct Answer: C) The reducing agent is the substance that donates electrons. 20. Which of the following represents a redox reaction:2H2 + O2 $\rightarrow$ 2H2O or NaCl $\rightarrow$ Na + Cl2? A) H2 + O2 $\rightarrow$ H2O. B) 2Na + Cl2 $\rightarrow$ 2NaCl. C) 2H2 + Cl2 $\rightarrow$ 2HCl. D) 2H2 + O2 $\rightarrow$ 2H2O. Show Answer Correct Answer: D) 2H2 + O2 $\rightarrow$ 2H2O. 21. What is the precipitate formed between potassium bromide and ammonium sulfide A) Potassium sulfide. B) Ammonium bromide. C) Potassium ammonium. D) No ppt is formed. Show Answer Correct Answer: D) No ppt is formed. 22. A decrease in oxidation number. A) Redox. B) Reduction. C) Oxidation. D) Dilute. Show Answer Correct Answer: B) Reduction. 23. Which of the following reactions is balanced by both mass and charge? A) Fe$^{+2}$ + Al $\rightarrow$Fe + Al$^{+3}$. B) Cu + Fe$^{+2}$ $\rightarrow$ Cu$^{+1}$ + Fe$^{+3}$. C) F$_{2}$ + Br$^{-}$ $\rightarrow$ F$^{-}$ + Br$_{2}$. D) Fe$^{+2}$ + 2 Cu $\rightarrow$ 2 Cu$^{+}$ + Fe. Show Answer Correct Answer: D) Fe$^{+2}$ + 2 Cu $\rightarrow$ 2 Cu$^{+}$ + Fe. 24. Which half-reaction correctly represents reduction? A) Ag $\rightarrow$ Ag$^{+}$ + e$^{-}$. B) F$_{2}$ $\rightarrow$ 2 F$^{-}$+ 2e$^{-}$. C) Au$^{3+}$ + 3e$^{-}$$\rightarrow$ Au. D) Fe$^{2+}$+ e$^{-}$ $\rightarrow$ Fe$^{3+}$. Show Answer Correct Answer: C) Au$^{3+}$ + 3e$^{-}$$\rightarrow$ Au. 25. How does a block of zinc attached to a steel ship hull protect the hull from corrosion? A) The zinc carries electrons toward the iron so that the iron cannot react. B) Zinc is a better oxidising agent so it corrodes instead of the iron corroding. C) Zinc is a better reducing agent so it corrodes instead of the iron corroding. D) The zinc carries electrons away from the iron so that the iron cannot react. Show Answer Correct Answer: C) Zinc is a better reducing agent so it corrodes instead of the iron corroding. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 1Class 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 10Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books