This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A chemical reaction that involves a gain/loss of electrons is called: A) Dehydration reaction. B) Respiration. C) Oxidation-Reduction. D) Hydrolysis. Show Answer Correct Answer: C) Oxidation-Reduction. 2. How is a reduction half reaction identified? A) Electrons on the right side. B) No electrons present. C) Protons on the left side. D) Electrons on the left side. Show Answer Correct Answer: D) Electrons on the left side. 3. Which is a difference between electrolytic and voltaic cells? A) Electrolysis reactions are spontaneous. B) The cathode is negative in electrolysis. C) Reduction occurs at the anode in electrolysis. D) Oxidation occurs at the negative electrode in electrolysis. Show Answer Correct Answer: B) The cathode is negative in electrolysis. 4. What happens during oxidation? A) A substance loses hydrogen. B) A substance gains hydrogen. C) A substance loses electrons. D) A substance gains electrons. Show Answer Correct Answer: C) A substance loses electrons. 5. In the reaction Zn + H$_{2}$O $\rightarrow$ ZnO$_{2}$ + H$_{2}$ which element is oxidized? A) Zinc. B) Hydrogen. C) Oxygen. D) None. Show Answer Correct Answer: A) Zinc. 6. What are the spectator ions in the reaction of sodium chloride with silver nitrate? A) Silver and nitrate. B) Sodium and chloride. C) Sodium and nitrate. D) Silver and chloride. Show Answer Correct Answer: C) Sodium and nitrate. 7. What type of reaction is this:SF$_{4 }$becomes SF$_{6}$ A) Hydrogenation. B) Reduction. C) Oxidation. D) None of the above. Show Answer Correct Answer: C) Oxidation. 8. What is the role of electrons in chemistry? A) All of the above. B) To bond atoms. C) To create energy. D) To form molecules. Show Answer Correct Answer: A) All of the above. 9. Which statement is true for a spontaneous redox reaction carried out at standard-state conditions? A) E$^\circ$$_{red}$ is always negative. B) E$^\circ$$_{cell}$ is always positive. C) E$^\circ$$_{ox}$ is always positive. D) E$^\circ$$_{red}$ is always positive. Show Answer Correct Answer: B) E$^\circ$$_{cell}$ is always positive. 10. What is the oxidation number for P in H$_{3}$PO$_{4}$? A) 3. B) 4. C) 5. D) 6. Show Answer Correct Answer: C) 5. 11. What is a half-reaction of this equation, Na + Cl $\rightarrow$ NaCl? A) Cl + e$^{-}$ $\rightarrow$ Cl$^{-}$. B) Cl-e$^{-}$ $\rightarrow$ Cl$^{-}$. C) Na $\rightarrow$ Na + e$^{-}$. D) Na$^\circ$ + Cl$^\circ$$\rightarrow$ Na$^{+1}$Cl$^{-1}$. Show Answer Correct Answer: A) Cl + e$^{-}$ $\rightarrow$ Cl$^{-}$. 12. What is the reducing agent of this reaction?2Al (s) + 6H$^{+ }$(aq)$_{ }$$\rightarrow$ 2Al$^{3+}$$_{ }$(aq) + 3H$_{2 }$(g) A) H$^{+}$. B) Al$^{3+}$. C) Al. D) H$_{2}$. Show Answer Correct Answer: C) Al. 13. Which formula contains nitrogen with an oxidation state of +3? A) NH$_{3}$. B) NO$_{2}$. C) KNO$_{2}$. D) HNO$_{3}$. Show Answer Correct Answer: C) KNO$_{2}$. 14. Oxidation involves A) Gaining electrons; gaining oxygen. B) Losing electrons; losing oxygen. C) Gaining electrons; losing oxygen. D) Losing electrons; gaining oxygen. Show Answer Correct Answer: D) Losing electrons; gaining oxygen. 15. How can the voltage of a galvanic cell be increased? A) By decreasing the concentration of the electrolyte. B) By connecting cells in series. C) By using a larger salt bridge. D) By reversing the direction of electron flow. Show Answer Correct Answer: B) By connecting cells in series. 16. Name one application of redox reactions in everyday life. A) Combustion of fuels. B) Rusting of iron. C) Batteries. D) Photosynthesis. Show Answer Correct Answer: C) Batteries. 17. KMnO$_{4}$ is strong oxidising agent in acid medium. To provide acid medium, H$_{2}$SO$_{4}$ is used instead of HCl because: A) H$_{2}$SO$_{4 }$is stronger acid than HCl. B) HCl is oxidised to Cl$_{2}$ by KMnO4. C) H$_{2}$SO$_{4 }$is dibasic acid. D) Rate is faster in the presence of H$_{2}$SO$_{4}$. Show Answer Correct Answer: B) HCl is oxidised to Cl$_{2}$ by KMnO4. 18. If HCl changes to chlorine gas it is A) Reduction. B) Oxidation. C) None of the above. D) Insufficient information. Show Answer Correct Answer: B) Oxidation. 19. E$^{0}$ values of some redox couples are given below. On the basis of these values choose the correct option.E$^{0 }$values:Br/Br$^{-}$ = + 1.90; Ag$^{+}$/Ag(s)=0.80 Cu$^{2+}$/Cu(s) = + 0.34; I$^{2}$ (s)/I$^{-}$ =+0.54 A) Cu will reduce Br$^{-}$. B) Cu will reduce Ag. C) Cu will reduce I$^{-}$. D) Cu will reduce Br$_{2}$. Show Answer Correct Answer: D) Cu will reduce Br$_{2}$. 20. Give the oxidation numbers of all the elements in the following molecules and ions:K2CrO4 A) +1, +7, -2. B) -1, -7, +2. C) +1, +7, +2. D) -2, +2, -7. Show Answer Correct Answer: A) +1, +7, -2. 21. Which gas is the strongest reducing agent? A) Br$^{-}$. B) Cl$^{-}$. C) F$^{-}$. D) I$^{-}$. Show Answer Correct Answer: C) F$^{-}$. 22. In a voltaic cell the ions flow through the A) Wire. B) Salt bridge. C) All the above. D) None of the above. Show Answer Correct Answer: B) Salt bridge. 23. Which of the following is not true of the Winkler method? A) It measures dissolved oxygen. B) BOD measures pollution. C) It uses a titration with potassium permanganate. D) Iodine is oxidized in the process. Show Answer Correct Answer: C) It uses a titration with potassium permanganate. 24. What is the oxidation state of iron in Fe$_{3}$O$_{4}$? A) +3. B) 0. C) -1. D) +2. Show Answer Correct Answer: A) +3. 25. The standard cell potential for the voltaic cell based on the reaction below is ..... V.Sn$^{2+ }$(aq) + 2 Fe$^{3+ }$(aq) $\rightarrow$ 2 Fe$^{2+ }$(aq) + Sn$^{4+ }$(aq) A) -0.46. B) +1.39. C) +0.617. D) +0.46. E) +1.21. Show Answer Correct Answer: C) +0.617. ← 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