This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 8 Redox Reactions Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the reaction Zn$_{(s)}$ + Fe$^{2+}$$_{(aq)}$ $\rightarrow$ Zn$^{2+}$$_{(aq)}$ + Fe$_{(s), }$which is the oxidant? A) Zn$_{(s)}$. B) Fe$^{2+}$$_{(aq)}$. C) Zn$^{2+}$$_{(aq)}$. D) Fe$_{(s)}$. Show Answer Correct Answer: B) Fe$^{2+}$$_{(aq)}$. 2. Of the following elements, ..... is the most easily oxidized. A) Oxygen. B) Fluorine. C) Nitrogen. D) Aluminum. E) Gold. Show Answer Correct Answer: D) Aluminum. 3. Oxidation state of nitrogen in lithium nitrite Li3N A) +3. B) +5. C) -3. D) -2. Show Answer Correct Answer: C) -3. 4. Which of the following is the correct name of the MnO$_{2}$? A) Manganese oxide. B) Manganese dioxide. C) Manganese(II) oxide. D) Manganese (IV) oxide. Show Answer Correct Answer: D) Manganese (IV) oxide. 5. Which statement correctly describes the 2 electrodes? A) The anode is negative and the cathode is positive. B) The anode and cathode are both positive. C) The anode is positive and the cathode is negative. D) The anode and cathode are both negative. Show Answer Correct Answer: C) The anode is positive and the cathode is negative. 6. A compound in which O has an oxidation number of +2 is A) H$_{2}$O. B) H$_{2}$O$_{2}$. C) OF$_{2}$. D) O$_{2}$F$_{2}$. Show Answer Correct Answer: C) OF$_{2}$. 7. Mg + PbCl2 $\rightarrow$ MgCl2 + Pb. Which statement correctly describes the oxidation and reduction that occur? A) Mg is oxidized and Cl-is reduced. B) Mg is oxidized and Pb+2 is reduced. C) Mg is reduced and Cl-is oxidized. D) Mg is reduced and Pb+2 is oxidized. Show Answer Correct Answer: B) Mg is oxidized and Pb+2 is reduced. 8. Which of these chemical substances can be used as oxidising agent A) Potassium iodide. B) Bromine water. C) Iron (II) sulphate. D) Zinc. Show Answer Correct Answer: B) Bromine water. 9. Determine the oxidation number of each element in H$_{2}$AsO$_{4}$ A) H:+1, As:+6, O:-2. B) H:+2, As:+6, O:-8. C) H:+1, As:-6, O:-8. D) H:+2, As:-2, O:-2. Show Answer Correct Answer: A) H:+1, As:+6, O:-2. 10. How many electrons are being accepted by fluorine in following reaction? F$_{2 }$ $\rightarrow$ 2F$^{-}$ A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 11. In the reaction 2Mg$_{(s)}$ + O$_{2(g)}$ $\rightarrow$ 2MgO$_{(s)}$, which is the oxidant? A) Mg$_{(s)}$. B) O2$_{(g)}$. C) MgO$_{(s)}$. D) None of the above. Show Answer Correct Answer: B) O2$_{(g)}$. 12. What is oxidation number of Fe in FeBr? A) +2. B) -2. C) 0. D) +1. Show Answer Correct Answer: D) +1. 13. In a redox reaction, the species reduced A) Gains electrons and is the oxidizing agent. B) Loses electrons and is the oxidizing agent. C) Loses electrons and is the reducing agent. D) Gains electrons and is the reducing agent. Show Answer Correct Answer: A) Gains electrons and is the oxidizing agent. 14. In the reaction Zn + H$_{2}$O $\rightarrow$ ZnO$_{2}$ + H$_{2, }$Identify the reducing agent. A) Zinc. B) Hydrogen. C) Oxygen. D) None. Show Answer Correct Answer: A) Zinc. 15. In the reaction Zn + H2O $\rightarrow$ ZnO + H2, which substance is oxidized? A) Zinc (Zn). B) Hydrogen (H2). C) Zinc Oxide (ZnO). D) Water (H2O). Show Answer Correct Answer: A) Zinc (Zn). 16. What is the oxidation state of chromium in K2Cr2O7? A) +3. B) +6. C) +4. D) +2. Show Answer Correct Answer: B) +6. 17. Oxygen usually has an oxidation number of ..... A) -1. B) +1. C) -2. D) +2. Show Answer Correct Answer: C) -2. 18. How do you balance the redox reaction of Cl2 with I-in acidic solution? A) Cl2 + I-$\rightarrow$ Cl-+ I2. B) Cl2 + 4I-+ 4H+ $\rightarrow$ 2Cl-+ 2I2 + 2H2O. C) Cl2 + 2I-+ H2O $\rightarrow$ 2Cl-+ I2 + 2H+. D) Cl2 + 2I-+ 2H+ $\rightarrow$ 2Cl-+ I2 + H2O. Show Answer Correct Answer: D) Cl2 + 2I-+ 2H+ $\rightarrow$ 2Cl-+ I2 + H2O. 19. What is the balanced equation for the reaction of MnO4-with I-in acidic solution? A) 8H+ + MnO4-+ 5I-$\rightarrow$ Mn2+ + 4H2O + 5I2. B) 2H+ + MnO4-+ 3I-$\rightarrow$ Mn2+ + 2H2O + 3I2. C) 4H+ + MnO4-+ 2I-$\rightarrow$ Mn2+ + 2H2O + 2I2. D) 6H+ + MnO4-+ 4I-$\rightarrow$ Mn2+ + 3H2O + 4I2. Show Answer Correct Answer: A) 8H+ + MnO4-+ 5I-$\rightarrow$ Mn2+ + 4H2O + 5I2. 20. Which of the following cannot act as oxidizing agent? A) O$_{2}$. B) KMnO$_{4}$. C) I$_{2}$. D) K$_{2}$Cr$_{2}$O$_{7}$. Show Answer Correct Answer: C) I$_{2}$. 21. An oxidizing agent will always ..... A) Be reduced. B) Increase in oxidation number. C) Increase in mass. D) Lose electrons. Show Answer Correct Answer: A) Be reduced. 22. What is a half-reaction in redox chemistry? A) A process that involves the complete reaction of a substance. B) A half-reaction is either the oxidation or reduction part of a redox reaction, showing the transfer of electrons. C) A reaction that occurs only in acidic solutions. D) A type of reaction that does not involve electron transfer. Show Answer Correct Answer: B) A half-reaction is either the oxidation or reduction part of a redox reaction, showing the transfer of electrons. 23. Oxygen mostly has an oxidation number of ..... A) -1. B) 1. C) 2. D) -2. Show Answer Correct Answer: D) -2. 24. Why are ionic equations useful? A) They show only the reacting ions. B) They simplify the reaction by including all ions. C) They highlight the role of spectator ions. D) They demonstrate the physical state of the reactants. Show Answer Correct Answer: A) They show only the reacting ions. 25. What are some applications of redox reactions in everyday life? A) Cooking food. B) Plant growth. C) Water purification. D) Applications of redox reactions include batteries, respiration, corrosion, and bleaching. Show Answer Correct Answer: D) Applications of redox reactions include batteries, respiration, corrosion, and bleaching. ← 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