This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Identify the oxidation state of nitrogen in NH3. A) -1. B) -3. C) +1. D) +3. Show Answer Correct Answer: B) -3. 2. What substance is oxidized in the reaction, Cr+ Sn4+ $\rightarrow$ A) Cr+. B) Sn4+. C) All the above. D) None of the above. Show Answer Correct Answer: A) Cr+. 3. The purpose of a salt bridge in an electrochemical cell is to ..... A) Transfer electrons. B) Transfer water. C) Transfer protons. D) Transfer positive and negative ions. Show Answer Correct Answer: D) Transfer positive and negative ions. 4. Zinc reacts with steam to form zinc oxide and hydrogen. Zn + H$_{2}$O $\rightarrow$ ZnO + H$_{2}$ During the reaction, which substance is oxidised? A) Hydrogen. B) Water. C) Zinc. D) Zinc oxide. Show Answer Correct Answer: C) Zinc. 5. What are spectator ions? A) Ions that do not take part in the reaction. B) Ions that change charge during the reaction. C) Ions that participate in the reaction. D) Ions that are only present in displacement reactions. Show Answer Correct Answer: A) Ions that do not take part in the reaction. 6. Which substance is reduced in the reaction, Cr+ + Sn4+ $\rightarrow$ A) Cr+. B) Sn4+. C) All the above. D) None of the above. Show Answer Correct Answer: B) Sn4+. 7. The surface of copper powder becomes black due to A) Copper oxide. B) Copper carbonate. C) Copper sulphate. D) Copper nitrate. Show Answer Correct Answer: A) Copper oxide. 8. What is the main chemical reaction occurring in a hydrogen-oxygen fuel cell? A) $CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$. B) $2H_2 + O_2 \rightarrow 2H_2O$. C) $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$. D) $2Na + Cl_2 \rightarrow 2NaCl$. Show Answer Correct Answer: B) $2H_2 + O_2 \rightarrow 2H_2O$. 9. In a net ionic equation, this compound, HNO$_{2}$ A) Will stay together. B) Will break apart. C) All the above. D) None of the above. Show Answer Correct Answer: A) Will stay together. 10. In which choice is N oxidized?A. NO$_{2}$ $\rightarrow$ N$_{2}$O$_{4}$B. NO$_{3}$$^{-}$ $\rightarrow$ NO$_{2}$C. N$_{2}$O$_{5}$ $\rightarrow$ NO$_{3}$$^{-}$D. H$_{3}$N $\rightarrow$ N$_{2}$ A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 11. What does the mnemonic OIL RIG stand for? A) Oxygen is lost, reduction is gained. B) Oxidation is loss, reduction is gain. C) Oxidation is gained, reduction is lost. D) Oxygen is gained, reduction is lost. Show Answer Correct Answer: B) Oxidation is loss, reduction is gain. 12. Would you use an oxidizing or reducing agent for this reaction to occur?SO $4$ $2-$ $\rightarrow$ $2-$ A) Oxidizing agent. B) Reducing agent. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reducing agent. 13. In which substance does sulfur have a negative oxidation number? A) CaSO$_{4}$. B) S. C) SO$_{2}$. D) Na$_{2}$S. Show Answer Correct Answer: D) Na$_{2}$S. 14. What is the oxidation of C in CH$_{4}$? A) -4. B) -1. C) +4. D) +1. Show Answer Correct Answer: A) -4. 15. In a voltaic cell, where do the electrons flow? A) From the anode to the cathode. B) From the cathode to the anode. C) From the salt bridge towards the anode. D) From the salt bridge towards the cathode. Show Answer Correct Answer: A) From the anode to the cathode. 16. In the reaction, Zn + H$_{2}$O $\rightarrow$ ZnO$_{2}$ + H$_{2, }$which element, if any, is oxidized? A) Zinc. B) Hydrogen. C) Oxygen. D) None. Show Answer Correct Answer: A) Zinc. 17. Oxygen shows positive oxidation state with which of the following element A) F. B) Cl. C) Na. D) Never. Show Answer Correct Answer: A) F. 18. This occurs when an atom's oxidation state decreases during a reaction. A) Oxidation. B) Reduction. C) Reduction-oxidation reaction. D) None of the given choices. Show Answer Correct Answer: B) Reduction. 19. A + Heat $\rightarrow$ C + D A) Endothermic. B) Exothermic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Endothermic. 20. The following statements are correct in terms with the oxidation-reduction (redox) reaction, except for? A) Spontaneous redox reactions are generally endothermic. B) All redox reactions involve the transfer of electrons from one atom to another. C) Reduction can be removal of oxygen/electronegative element from a substance. D) Oxidation can be removal of hydrogen/ electropositive element from a substance. Show Answer Correct Answer: A) Spontaneous redox reactions are generally endothermic. 21. In a redox reaction, electrons are A) Transferred from the species that's reduced to the species that's oxidized. B) Transferred from the species that's oxidized to the species that's reduced. C) All the above. D) None of the above. Show Answer Correct Answer: B) Transferred from the species that's oxidized to the species that's reduced. 22. The substance that gets oxidised in a reaction is called oxidising agent. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 23. If an atom loses electrons during a chemical reaction, the atom was: A) Oxidized. B) Reduced. C) Neutralized. D) Precipitated. Show Answer Correct Answer: A) Oxidized. 24. The oxidation number for a pure element is? A) +1. B) +2. C) 0. D) -1. E) -2. Show Answer Correct Answer: C) 0. 25. Which of the following is the correct half-reaction for the oxidation process in a redox reaction? A) $Cu^{2+} + 2e^-\rightarrow Cu$. B) $Zn \rightarrow Zn^{2+} + 2e^-$. C) $2H^+ + 2e^-\rightarrow H_2$. D) $O_2 + 4e^-\rightarrow 2O^{2-}$. Show Answer Correct Answer: B) $Zn \rightarrow Zn^{2+} + 2e^-$. ← 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