Redox Reactions Quiz - CBSE Class 11 Chemistry

Free practice quiz: Redox Reactions (CBSE Class 11 Chemistry). 43 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Chemistry practice quiz has 43 multiple-choice questions on Redox Reactions. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is a characteristic of a redox reaction?

   1. It involves the transfer of electrons
   2. There is no change in oxidation states
   3. It only involves covalent bonds
   4. It is an endothermic process
   Show answer

   Answer: A. It involves the transfer of electrons

2. In a redox reaction, what is oxidized?

   1. The species that gains electrons
   2. The species that loses electrons
   3. The species that remains unchanged
   4. The species that is in solid form
   Show answer

   Answer: B. The species that loses electrons

3. What is the oxidation state of sulfur in H2SO4?

   1. 0
   2. +4
   3. +6
   4. -2
   Show answer

   Answer: C. +6

4. What is the final product of the reaction between Na and Cl2?

   1. NaCl
   2. NaCl2
   3. Cl
   4. Na2Cl
   Show answer

   Answer: A. NaCl

5. Identify the redox pair in the reaction: CuO + H2 -> Cu + H2O.

   1. CuO and Cu
   2. H2 and H2O
   3. Cu and H2O
   4. None of the above
   Show answer

   Answer: A. CuO and Cu

More questions in this quiz

Answers and explanations are in the full quiz.

1. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, what is being reduced?
2. Identify the reducing agent in the following reaction: 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O.
3. In redox reactions, which of the following species is oxidized?
4. Consider the half-reaction: Cr2O7^2- + 14H+ + 6e- → 2Cr^3+ + 7H2O. What is the change in oxidation state of chromium?
5. In a redox reaction, if the oxidizing agent is completely reduced, what happens to the reducing agent?
6. What is the importance of the standard reduction potential in redox reactions?
7. Which of the following represents a reduction process?
8. What is the oxidation state of sulfur in H₂SO₄?
9. In the reaction 2MnO₄⁻ + 16H⁺ + 10e⁻ → 2Mn²⁺ + 8H₂O, what is being reduced?
10. Which compound acts as a reducing agent in the equation 2CuO + C → 2Cu + CO₂?
11. What is the overall cell reaction for the redox reaction in a zinc-copper galvanic cell?
12. Which of the following statements is true for a redox reaction?
13. In which of the following reactions is chlorine oxidized?
14. In the redox reaction 4Fe + 3O₂ → 2Fe₂O₃, what is the oxidation state of iron in Fe₂O₃?
15. Which of the following is a characteristic of a reducing agent in a redox reaction?
16. In a redox reaction, if the oxidation state of an element decreases, it is:
17. Identify the proper half-reaction for the reduction of permanganate ion (MnO4-) in acidic medium.
18. What is the primary product of the combustion of hydrogen gas in oxygen?
19. Determine the oxidation states of iodine (I2) in the reaction 2 HI + Cl2 → 2 HCl + I2.
20. What happens to the oxidation state of bromine in the reaction 2Br- + Cl2 → 2Cl- + Br2?
21. In the electrolysis of water, what is oxidized?
22. Which species acts as a reducing agent in the following reaction: 2Ag2O + C → 4Ag + CO2?
23. Which of the following species is oxidized in the reaction 2Mg + O2 -> 2MgO?
24. In the reaction 4Fe + 3O2 -> 2Fe2O3, which element is reduced?
25. Which of the following is a redox reaction?
26. What is the role of a reducing agent in a redox reaction?
27. In the redox reaction Cl2 + 2NaBr -> 2NaCl + Br2, which species is the oxidizing agent?
28. Which of the following statements is true about oxidation?
29. In a redox reaction, if a substance loses electrons, it is:
30. What is the oxidation number of nitrogen in NH4+?
31. In the reaction 2Mg + O2 -> 2MgO, the oxidation number of oxygen changes from:
32. During the oxidation of glucose (C6H12O6), which molecule is formed?
33. When you balance redox reactions in acidic medium, what do you need to add to balance oxygen atoms?
34. Which type of redox reaction involves a single displacement?
35. Identify the oxidation state of Chromium in Cr2O7^2-.
36. In a galvanic cell, the anode is where the:
37. Which of the following reactions releases energy?
38. What happens to the oxidation state during a combustion reaction?

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