This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A fuel cell ..... A) Does not form any products. B) Has a negative cell potential. C) Uses a spontaneous reaction to generate electricity. D) Produces its own fuel. Show Answer Correct Answer: C) Uses a spontaneous reaction to generate electricity. 2. In a redox reaction, the species that loses electrons ..... A) Is called the cathode. B) Is oxidized. C) Decreases in oxidation number. D) Gains mass at the electrode. Show Answer Correct Answer: B) Is oxidized. 3. What is the oxidation number of iodine in KIO$_{3}$? A) 5. B) 1. C) 0. D) -1. Show Answer Correct Answer: A) 5. 4. Which of the following will not show disproportionation reaction: A) ClO$^{-}$. B) ClO$_{2}$$^{-}$. C) ClO$_{3}$$^{-}$. D) ClO$_{4}$$^{-}$. Show Answer Correct Answer: D) ClO$_{4}$$^{-}$. 5. Does every element have only one single oxidation number? A) Yes. B) No. C) Maybe so. D) None of the above. Show Answer Correct Answer: B) No. 6. Why is oxygen considered the quintessential oxidizer? A) It donates electrons to other molecules. B) It stabilizes molecules by adding electrons. C) It pulls electrons off of one molecule to make itself more stable. D) It always gains protons in reactions. Show Answer Correct Answer: C) It pulls electrons off of one molecule to make itself more stable. 7. What type of reaction is represented by 2Na + Cl2 $\rightarrow$ 2NaCl? A) Combination. B) Decomposition. C) Displacement. D) Redox. Show Answer Correct Answer: A) Combination. 8. What happens to the oxidation number of an element when it is reduced? A) It increases. B) It decreases. C) It remains unchanged. D) It becomes zero. Show Answer Correct Answer: B) It decreases. 9. A redox reaction is A) A neutralization reaction. B) All reactions. C) A reaction in which electrons are transferred from one element to another. D) Non of these are correct. Show Answer Correct Answer: C) A reaction in which electrons are transferred from one element to another. 10. What is the name of the negative electrode? A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Cathode. 11. What is the oxidizing agent of this reaction?3Mg + N$_{2 }$$\rightarrow$ Mg$_{3}$N$_{2}$ A) Mg. B) N$_{2}$. C) Mg$_{3}$N$_{2}$. D) MgN. Show Answer Correct Answer: B) N$_{2}$. 12. Here is the oxidized half-reaction for a reaction in an acidic solution.Cr$_{2}$O$_{7}$$^{2-}$$_{(}$$_{aq}$$_{)}$ $\rightarrow$ Cr$^{3+}$$_{(}$$_{aq}$$_{)}$Determine how many electrons are needed to add to this half reaction to start the balancing process? A) 3e$^{-}$. B) 2 e$^{-}$. C) 6 e$^{-}$. D) 1 e$^{-}$. Show Answer Correct Answer: C) 6 e$^{-}$. 13. In the reaction $2Na + Cl_2 \rightarrow 2NaCl$ A) Sodium (Na). B) Chlorine (Cl 2). C) Sodium chloride (NaCl). D) None. Show Answer Correct Answer: B) Chlorine (Cl 2). 14. The sum of oxidation numbers of all the atoms in a compound ion is equal to ..... A) The charge of the high electronegative atom. B) Zero. C) The overall charge of the compound ion. D) Total number of atoms. Show Answer Correct Answer: C) The overall charge of the compound ion. 15. C in CO$_{3}$$^{2-}$? A) -4. B) +2. C) 0. D) +4. Show Answer Correct Answer: D) +4. 16. For the following example, identify the reducing agent:(The reactant that is oxidized.)H$_{2}$ + Cl$_{2}$ $\rightarrow$ 2HCl A) H$_{2}$. B) Cl$_{2}$. C) Both. D) None of the above. Show Answer Correct Answer: A) H$_{2}$. 17. Explain the concept of adding H+ and H2O to balance redox equations in acidic solutions. A) Multiply H+ and H2O to balance the equation in acidic solutions. B) Subtract H+ and H2O to balance the equation in acidic solutions. C) Divide H+ and H2O to balance the equation in acidic solutions. D) Add H+ and H2O to balance the equation in acidic solutions. Show Answer Correct Answer: D) Add H+ and H2O to balance the equation in acidic solutions. 18. What is the balanced equation for the reaction of KMnO4 with H2O2? A) KMnO4 + 2 H2O2 + 2 H+ $\rightarrow$ MnO4 + 2 O2 + 2 H2O. B) 2 KMnO4 + 5 H2O2 + 6 H+ $\rightarrow$ 2 Mn2+ + 5 O2 + 8 H2O. C) 2 KMnO4 + 3 H2O2 + 4 H+ $\rightarrow$ 2 MnO4 + 3 O2 + 6 H2O. D) KMnO4 + H2O2 + H+ $\rightarrow$ MnO2 + O2 + H2O. Show Answer Correct Answer: B) 2 KMnO4 + 5 H2O2 + 6 H+ $\rightarrow$ 2 Mn2+ + 5 O2 + 8 H2O. 19. ..... is defined as the loss of electrons. A) Oxidation. B) Reduction. C) Redox. D) Combustion. Show Answer Correct Answer: A) Oxidation. 20. What is the significance of the electron transfer in redox reactions? A) It is essential for energy transfer in chemical processes and is fundamental to processes like combustion and respiration. B) It helps in the formation of ionic bonds between atoms. C) It allows for the stabilization of free radicals in chemical reactions. D) It is primarily responsible for the color changes in chemical reactions. Show Answer Correct Answer: A) It is essential for energy transfer in chemical processes and is fundamental to processes like combustion and respiration. 21. What is the oxidation number of chromium in $K_2CrO_4$ A) +6. B) +3. C) +2. D) +1. Show Answer Correct Answer: A) +6. 22. The following is what type of reaction:NH$_{3}$ + HCl $\rightarrow$ NH$_{4}$Cl A) Synthesis. B) Decomposition. C) Single Replacement Replacement. D) Double Replacement Replacement. Show Answer Correct Answer: A) Synthesis. 23. Which statement defines oxidation? A) Increase in oxidation number. B) Gain of hydrogen. C) Loss of oxygen. D) Gain of electron. Show Answer Correct Answer: A) Increase in oxidation number. 24. If Magnesium is a reducing agent, therefore Magnesium is ..... A) Electron acceptor. B) Electron donor. C) All the above. D) None of the above. Show Answer Correct Answer: B) Electron donor. 25. What are spectator ions in ionic equations? A) Ions that actively participate in the reaction. B) Ions that remain unchanged and do not participate in the reaction. C) Ions that are formed as products. D) Ions that are consumed during the reaction. Show Answer Correct Answer: B) Ions that remain unchanged and do not participate in the reaction. ← 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