This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the reaction 2Ca(s) + O$_{2}$(g) $\rightarrow$ 2CaO(s), calcium is ..... A) Reduced. B) Synthesized. C) Oxidized. D) None of the above. Show Answer Correct Answer: C) Oxidized. 2. Which of the following metals will not corrode easily? A) Iron. B) Aluminium. C) Gold. D) Zinc. Show Answer Correct Answer: C) Gold. 3. The species that loses electron is ..... and usually ..... agent. A) Oxidized;reducing. B) Reduced;oxidizing. C) Oxidized;oxidizing. D) Reduced;reducing. Show Answer Correct Answer: A) Oxidized;reducing. 4. Calculate the standard cell potential for the reaction:$Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$ $E^\circ_{Zn^{2+}/Zn} =-0.76 \, V$ $E^\circ_{Cu^{2+}/Cu} = +0.34 \, V$ A) +1.10 V. B) -1.10 V. C) +0.42 V. D) -0.42 V. Show Answer Correct Answer: A) +1.10 V. 5. Which of the following is not an example of redox reaction? A) CuO + H$_{2 }$ > Cu + H$_{2}$0. B) Fe$_{2}$O$_{3}$+ 3CO $\rightarrow$ 2Fe + 3C0$_{2}$. C) 2K + F$_{2}$$\rightarrow$ 2KF. D) BaCl$_{2}$ + H$_{2}$S0$_{4}$ $\rightarrow$ BaSO$_{4}$ + 2HCl. Show Answer Correct Answer: D) BaCl$_{2}$ + H$_{2}$S0$_{4}$ $\rightarrow$ BaSO$_{4}$ + 2HCl. 6. Which type of reaction is the conversion of iron oxide to iron and oxygen? A) Oxidation. B) Reduction. C) Neutralisation. D) Combination. Show Answer Correct Answer: B) Reduction. 7. In order to be considered an oxidation-reduction reaction, A) A precipitate must form. B) The oxidation number of two species must change. C) The pH must change. D) None of the above. Show Answer Correct Answer: B) The oxidation number of two species must change. 8. Which example shows combination reaction? A) 2NaH $\rightarrow$ 2Na + H$_{2}$. B) 4Fe+ 3O$_{2}$$\rightarrow$2Fe$_{2}$O$_{3}$. C) P$_{4}$ + 3NaOH + 3H$_{2}$O $\rightarrow$ 3NaH$_{2}$PO$_{2}$ + PH$_{3}$. D) None of the above. Show Answer Correct Answer: B) 4Fe+ 3O$_{2}$$\rightarrow$2Fe$_{2}$O$_{3}$. 9. Cl$_{2}$ + 2e$^{-}$ $\rightarrow$ 2Cl $^{-}$ is an example of: A) Redox. B) Oxidation. C) Reduction. D) None of the above. Show Answer Correct Answer: C) Reduction. 10. What element always has an oxidation number of-1? A) Hydrogen. B) Fluorine. C) Chlorine. D) Iodine. Show Answer Correct Answer: B) Fluorine. 11. What is the most important type of reaction in chemistry involving electron transfer? A) Ionic bond reactions. B) Covalent bond reactions. C) Redox reactions. D) Acid base reactions. Show Answer Correct Answer: C) Redox reactions. 12. Which element is reduced in the following reaction?2K$_{2}$Cr$_{2}$O$_{7}$ + 2H$_{2}$O + 3S $\rightarrow$ 3SO$_{2}$ + 4KOH + 2Cr$_{2}$O$_{3}$ A) K. B) Cr. C) O. D) S. Show Answer Correct Answer: D) S. 13. Which is not a redox reaction? A) Apple turning brown. B) Corrosion (rusting). C) Cellular respiration. D) Baking a cake. Show Answer Correct Answer: D) Baking a cake. 14. What is lost or gained in a redox reaction? A) Atoms. B) Ions. C) Protons. D) Electrons. Show Answer Correct Answer: D) Electrons. 15. Which of the following is an oxidation process? A) Carbon dioxide loses oxygen. B) A bromine atom gains an electron. C) A chlorine molecule gains hydrogen. D) A sodium atom loses an electron. Show Answer Correct Answer: D) A sodium atom loses an electron. 16. For lithium-ion batteries ..... A) Lithium is the anode. B) Electrons flow from lithium to graphite. C) Electrons flow from graphite to lithium. D) Graphite is the cathode. Show Answer Correct Answer: C) Electrons flow from graphite to lithium. 17. Which of the following is the formula of Tin(IV) oxide? A) TiO$_{4}$. B) TiO$_{2}$. C) SnO$_{2}$. D) SnO$_{4}$. Show Answer Correct Answer: C) SnO$_{2}$. 18. What is the oxidation number of phosphorus in H3PO4? A) 0. B) +5. C) +1. D) +3. Show Answer Correct Answer: B) +5. 19. What is the relationship between redox reactions and electrochemistry? A) Redox reactions only occur in non-aqueous solutions. B) Redox reactions are fundamental to electrochemistry as they involve electron transfer, which is the basis for generating or using electrical energy. C) Electrochemistry is unrelated to chemical reactions. D) Redox reactions do not involve electron transfer. Show Answer Correct Answer: B) Redox reactions are fundamental to electrochemistry as they involve electron transfer, which is the basis for generating or using electrical energy. 20. What is the position of hydrogen ion in the electrochemical series? A) Between lead (II) ion and iron (III) ion. B) Between zinc iron and iron (II) ion. C) Between lead (II) ion and copper (II) ion. D) Between zinc ion and tin (II) ion. Show Answer Correct Answer: C) Between lead (II) ion and copper (II) ion. 21. Which of the following pairs is an example of conjugate redox pairs? A) $Fe^{2+}/Fe^{3+}$. B) $H_2O/O_2$. C) $Na/Na^+$. D) $Cl_2/Cl^-$. Show Answer Correct Answer: A) $Fe^{2+}/Fe^{3+}$. 22. Which of the following is NOT a characteristic of redox reactions? A) They involve electron transfer. B) They always occur in aqueous solutions. C) They can be split into half-reactions. D) They follow the law of conservation of charge (mass). Show Answer Correct Answer: B) They always occur in aqueous solutions. 23. What is the primary characteristic of redox reactions? A) They do not involve electron transfer. B) They involve both oxidation and reduction. C) They involve only reduction. D) They involve only oxidation. Show Answer Correct Answer: B) They involve both oxidation and reduction. 24. Name the oxidising agent in the following reaction:nitrogen + hydrogen $\rightarrow$ ammoniaN2 + 3 H2 ..... 2 NH3 A) Nitrogen. B) Hydrogen. C) Ammonia. D) None of the above. Show Answer Correct Answer: A) Nitrogen. 25. Consider the following REDOX reaction:Cl$_{2}$(g) $\rightarrow$ ClO$^{-}$(aq) + Cl$^{-}$(aq) (basic solution)Which species is the result of oxidation? A) Cl$^{-}$. B) ClO$^{-}$. C) All the above. D) None of the above. Show Answer Correct Answer: B) ClO$^{-}$. ← 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