This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In which of the following compounds, an element exhibits two different oxidation states? A) NH$_{2}$OH. B) NH$_{4}$NO$_{3}$. C) N$_{2}$H$_{4}$. D) N$_{3}$H. Show Answer Correct Answer: B) NH$_{4}$NO$_{3}$. 2. As the pH of a solution gets lower, the solution becomes more ..... A) Acidic. B) Basic (or alkaline). C) Neutral. D) Ionic. Show Answer Correct Answer: A) Acidic. 3. What is the outcome when calcium reacts with iron sulfate? A) No reaction occurs. B) Calcium and iron form a compound. C) Calcium displaces iron. D) Iron displaces calcium. Show Answer Correct Answer: C) Calcium displaces iron. 4. The atomic number of Element Z is 13. The oxidation state of an ion of Element Z would MOST probably be A) -5. B) -3. C) +3. D) +5. Show Answer Correct Answer: C) +3. 5. In the reaction CuO + H$_{2}$ $\rightarrow$ Cu + H$_{2}$O, which element is reduced? A) Copper. B) Oxygen. C) Hydrogen. D) None. Show Answer Correct Answer: A) Copper. 6. Which of the following is a condition for a standard cell? A) 0.1 M concentration for solutions. B) 100 kPa pressure for a gas. C) 273 K temperature. D) Measured against zinc. Show Answer Correct Answer: B) 100 kPa pressure for a gas. 7. Which of the following species is the strongest oxidizing agent under standard-state conditions? A) Ag$^{+}$(aq). B) H$_{2}$(g). C) H$^{+}$(aq). D) Cl$_{2}$(g). E) Al$^{3+}$(aq). Show Answer Correct Answer: D) Cl$_{2}$(g). 8. What happens to the oxidation number of an element that is oxidized? A) The oxidation number decreases. B) The oxidation number remains the same. C) The oxidation number increases. D) The oxidation number fluctuates. Show Answer Correct Answer: C) The oxidation number increases. 9. What is the half-reaction method used for in balancing redox reactions? A) To identify the type of redox reaction. B) To calculate the overall energy change in a reaction. C) To balance redox reactions by separating oxidation and reduction processes. D) To determine the physical states of reactants and products. Show Answer Correct Answer: C) To balance redox reactions by separating oxidation and reduction processes. 10. Combustion reaction is an example of a redox reaction A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 11. In a galvanic cell, where does the oxidation reaction take place? A) Circuit. B) Salt bridge. C) Cathode. D) Anode. Show Answer Correct Answer: D) Anode. 12. What is the most likely oxidation state of aluminum (Al)? A) -3. B) +2. C) -2. D) +3. Show Answer Correct Answer: D) +3. 13. Which of the following is a characteristic of a redox reaction? A) Transfer of electrons between species. B) Formation of a precipitate. C) Absorption of heat. D) Release of light. Show Answer Correct Answer: A) Transfer of electrons between species. 14. What is the oxidation number of each atom in sodium chlorate NaClO$_{3}$? A) Na = +1; Cl = +5; O =-2. B) Na = +1; Cl = +7; O =-4. C) Na = +1; Cl = +7; O =-2. D) Na = +1; Cl = +3; O =-1. E) Na =-1; Cl = +5; O =-2. Show Answer Correct Answer: A) Na = +1; Cl = +5; O =-2. 15. Which of the following is a characteristic of oxidation? A) Addition of hydrogen. B) Loss of hydrogen. C) Reduction of electronegative elements. D) Gain of electrons. Show Answer Correct Answer: B) Loss of hydrogen. 16. Oxidizing agents are substances that oxidizes another substance ..... A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 17. If the oxidation number of an element reduces in a redox reaction, then this corresponds to the process of ..... A) Reduction. B) Oxidation. C) All the above. D) None of the above. Show Answer Correct Answer: A) Reduction. 18. Define reduction in terms of electron transfer. A) Reduction is the process in which an atom, ion, or molecule loses electrons. B) Reduction is the process in which an atom, ion, or molecule gains electrons. C) Reduction is the process in which an atom, ion, or molecule undergoes a change in temperature. D) Reduction is the process in which an atom, ion, or molecule combines with oxygen. Show Answer Correct Answer: B) Reduction is the process in which an atom, ion, or molecule gains electrons. 19. What is a redox reaction? A) A reaction where both reactants get reduced. B) A reaction where both reactants get oxidized. C) A reaction that involves a transfer of electrons between reactants. D) A reaction that involves the combustion of at least one reactant. Show Answer Correct Answer: C) A reaction that involves a transfer of electrons between reactants. 20. What is a common rule for assigning oxidation states to oxygen? A) +2. B) Zero. C) -2. D) +1. Show Answer Correct Answer: C) -2. 21. Defined as the gain of electrons A) Oxidation. B) Reduction. C) Redox. D) OIL RIG. Show Answer Correct Answer: B) Reduction. 22. This is the half reaction for:Sn(s) $\rightarrow$ Sn$^{4+}$(aq) + 4e$^{-}$ A) Redox. B) Reduction. C) Oxidation. D) Neutralization. Show Answer Correct Answer: C) Oxidation. 23. Which of the following is an example of a redox reaction involving a metal and a non-metal? A) $\text{Mg} + \text{O}_2 \rightarrow \text{MgO}$. B) $\text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl}$. C) $\text{C} + \text{O}_2 \rightarrow \text{CO}_2$. D) $\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3$. Show Answer Correct Answer: A) $\text{Mg} + \text{O}_2 \rightarrow \text{MgO}$. 24. If an atom is reduced in a redox reaction, what must happen to another atom in the system? A) It must be oxidised. B) It must be reduced. C) It must be neutralised. D) Nothing needs to happen to another atom in the system. Show Answer Correct Answer: A) It must be oxidised. 25. In the following reaction, which species is the oxidizing agent and which gets reduced?2H$^{+}$$_{(aq)}$ + Mn$_{(s) }$$\rightarrow$ Mn$^{2+}$$_{(aq)}$ + H$_{2(g)}$ A) H$^{+}$ is the oxidizing agent and Mn gets reduced. B) H$^{+}$ is the oxidizing agent and H$^{+ }$gets reduced. C) Mn is the oxidizing agent and H$^{+ }$gets reduced. D) Mn is the oxidizing agent and Mn gets reduced. E) Mn is the oxidizing agent and Mn$^{2+}$ gets reduced. Show Answer Correct Answer: B) H$^{+}$ is the oxidizing agent and H$^{+ }$gets reduced. ← 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 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