This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 17 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What kind of equation is this:2KI + MgCl$_{2}$ + 200KJ $\rightarrow$ 2KCl + MgI$_{2}$ A) Endothermic. B) Exothermic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Endothermic. 2. What is the function of the salt bridge in an electrochemical cell? A) To increase the cell's electrical resistance. B) To provide a path for electrons to move between the electrodes. C) To prevent the electrodes from physically touching each other. D) To maintain electrical neutrality by allowing the flow of ions. Show Answer Correct Answer: D) To maintain electrical neutrality by allowing the flow of ions. 3. Determine the oxidation number of chromate in CrO$_{4}$$^{2-}$. A) +6. B) 0. C) +2. D) +3. Show Answer Correct Answer: A) +6. 4. Which is true of the colorful electrolysis of water demo? A) Hydrogen gas was produced at the anode. B) The pH was high where hydrogen gas was produced. C) Oxygen gas was produced twice as fast. D) It turned purple at the cathode. Show Answer Correct Answer: D) It turned purple at the cathode. 5. Explain how redox reactions are involved in cellular respiration. A) Redox reactions only occur in photosynthesis. B) Redox reactions in cellular respiration involve the oxidation of glucose and the reduction of oxygen, facilitating energy production. C) Cellular respiration does not involve any electron transfer. D) Oxygen is oxidized while glucose is reduced during respiration. Show Answer Correct Answer: B) Redox reactions in cellular respiration involve the oxidation of glucose and the reduction of oxygen, facilitating energy production. 6. What coefficients are needed to correctly balance the equation? ..... Bi + ..... O$_{2}$$_{ }$ $\rightarrow$ ..... Bi$_{2}$O$_{3}$ A) 3, 2, 3. B) 2, 3, 2. C) 4, 3, 2. D) None of these. Show Answer Correct Answer: C) 4, 3, 2. 7. In a reaction, Iron (II) Sulphate changed colour from green to brown. The reaction that occur is A) Reduction of Fe2+ to Fe3+. B) Oxidation of Fe3+ to Fe2+. C) Reduction of Fe3+ to Fe2+. D) Oxidation of Fe2+ to Fe3+. Show Answer Correct Answer: D) Oxidation of Fe2+ to Fe3+. 8. What is the oxidation number of oxygen in oxygen gas, $O_2$ A) -2. B) 0. C) -1. D) +1. Show Answer Correct Answer: B) 0. 9. Balance the following redox equations for reactions that occur in neutral solution:Zn + Ag+ $\rightarrow$ Zn$^{2+}$ + Ag A) Zn + 2Ag$^{+}$ $\rightarrow$ Zn$^{2+}$ + 2Ag. B) Zn + Ag$^{+}$ $\rightarrow$ Zn$^{2+}$ + Ag. C) Zn + 2Ag$^{+}$ $\rightarrow$ Zn$^{2+}$ + Ag. D) Zn+ Ag$^{+}$ $\rightarrow$ 2 Zn$^{2+ }$+ 2Ag. Show Answer Correct Answer: A) Zn + 2Ag$^{+}$ $\rightarrow$ Zn$^{2+}$ + 2Ag. 10. The strongest reductant from the following list:Fe$^{3+}$; Sn$^{2+}$; H$_{2}$O; K$^{+}$; Br$^{-}$; Au; Pb$^{2+}$ is A) K$^{+}$. B) Fe$^{3+}$. C) Sn$^{2+}$. D) Au. Show Answer Correct Answer: C) Sn$^{2+}$. 11. Study this half-reaction:Cu $\rightarrow$ Cu$^{2+}$ + 2e$^{-}$Which statement is INCORRECT? A) Two electrons are released. B) Copper becomes more positively-charged. C) Copper is reduced. D) None of the above. Show Answer Correct Answer: C) Copper is reduced. 12. In the standardisation of Na$_{2}$S$_{2}$O$_{3}$ using K$_{2}$Cr$_{2}$O$_{7}$ by iodometry, the equivalent weight of K$_{2}$Cr$_{2}$O$_{7}$ is: A) Molecular weight / 2. B) Molecular weight / 6. C) Molecular weight / 3. D) Same molecular weight. Show Answer Correct Answer: B) Molecular weight / 6. 13. What is the oxidation state of Cu in Cu$^{2+}$? A) -1. B) -2. C) +2. D) 0. Show Answer Correct Answer: C) +2. 14. Determine the oxidation number of Chromium in CrO$_{4}$$^{2-}$. A) +6. B) 0. C) +2. D) +3. Show Answer Correct Answer: A) +6. 15. What is an oxidation state? A) The physical state the element is in before a reaction. B) The number of atoms of that element in a compound. C) The number of electrons transferred in the reaction. D) The charge an element would have if it were an ion. Show Answer Correct Answer: D) The charge an element would have if it were an ion. 16. How does the electrochemical series help in designing galvanic cells? A) By providing the color of the electrodes for aesthetic design. B) By indicating the solubility of electrolytes in water. C) By predicting the spontaneity of redox reactions and determining the direction of electron flow. D) By determining the size of the cell components. Show Answer Correct Answer: C) By predicting the spontaneity of redox reactions and determining the direction of electron flow. 17. What is the oxidation number of chlorine in HClO? A) 0. B) -1. C) +1. D) +5. Show Answer Correct Answer: C) +1. 18. NADH is a ..... form of NAD+. A) Reduced. B) Oxidized. C) Catabolized. D) Hydrolized. Show Answer Correct Answer: A) Reduced. 19. Which type of reaction is this?P$_{4}$ + 3NaOH + 3H$_{2}$O $\rightarrow$ 3NaH$_{2}$PO$_{2}$ + PH$_{3}$ A) Oxidation. B) Reduction. C) Disproportionation. D) None. Show Answer Correct Answer: C) Disproportionation. 20. In the context of balancing redox equations, what does it mean to "balance the charge" ? A) Ensuring that the same number of electrons is produced and consumed. B) Making sure the total number of atoms is the same on both sides of the equation. C) Adjusting the pH of the solution. D) Adding water molecules to balance the hydrogen atoms. Show Answer Correct Answer: A) Ensuring that the same number of electrons is produced and consumed. 21. Acidified potassium manganate (VII) is a strong oxidizing agent. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. Determine the oxidation number of each element in XeO$_{4}$$^{-2}$ A) Xe:+6, O:-2. B) Xe:+8, O:-2. C) Xe:+6, O:-6. D) Xe:-8, O:+8. Show Answer Correct Answer: A) Xe:+6, O:-2. 23. A/an ..... agent is a substance that has the potential to cause another substance to be oxidized. A) Reducing. B) Oxidizing. C) Chemical. D) Biological. Show Answer Correct Answer: B) Oxidizing. 24. ..... electrode is an inert electrode. A) Copper. B) Iron. C) Carbon. D) Zinc. Show Answer Correct Answer: C) Carbon. 25. What does it mean if a substance is reduced? A) It means it has lost electrons and its oxidation state has increased. B) It means it has gained electrons and its oxidation state has decreased. C) It means it has remained unchanged in terms of electrons and oxidation state. D) It means it has been converted into a gas. Show Answer Correct Answer: B) It means it has gained electrons and its oxidation state has decreased. ← 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