Understanding redox reactions is a fundamental part of the Class 11 Chemistry curriculum. Redox reactions, short for reduction-oxidation reactions, involve the transfer of electrons between two substances. They are pivotal in both organic and inorganic chemistry and are directly linked to concepts such as electron transfer, oxidation states, and the identification of reducing and oxidizing agents. To help students reinforce their understanding and assess their knowledge, multiple-choice questions (MCQs) are an excellent tool.
This collection of Redox Reaction Class 11 MCQ with Answers is designed to provide a comprehensive overview of the topic, offering students the opportunity to practice and test their grasp of redox reactions. Each question is carefully crafted to challenge students’ understanding while helping them to prepare effectively for their exams. The answers are included to ensure immediate feedback, enabling learners to identify areas that require further study.
For those looking to delve deeper or use these resources for revision, a Redox Reaction Class 11 MCQ PDF can be particularly useful. It provides a printable format that students can use for offline study. This collection is not only a valuable resource for self-assessment but also serves as a vital tool for teachers who wish to provide additional support through practice questions. As students work through these Redox Reaction MCQ with Answers, they will enhance their problem-solving skills and deepen their comprehension of this crucial chemical process.
Redox Reaction class 11 MCQ with Answers
Q. What does the term ‘redox’ stand for?
A) Reduction of oxygen
B) Reduction and oxidation
C) Reduction or oxygenation
D) None of the above
Answer: B) Reduction and oxidation
Q. Which of the following is an example of a redox reaction?
A) NaCl forming from Na and Cl
B) H₂ + Cl₂ → 2HCl
C) NaOH dissolving in water
D) Boiling of water
Answer: B) H₂ + Cl₂ → 2HCl
Q. In a redox reaction, the substance that gains electrons is:
A) Reduced
B) Oxidized
C) A reducing agent
D) An oxidizing agent
Answer: A) Reduced
Q. Which of the following is not true about oxidation?
A) It involves the gain of electrons
B) It can involve the addition of oxygen
C) It may involve the loss of hydrogen
D) It is always associated with reduction
Answer: A) It involves the gain of electrons
Q. Which of the following statements about reducing agents is correct?
A) They gain electrons
B) They lose electrons
C) They are always metals
D) They increase oxidation state
Answer: B) They lose electrons
Q. The oxidation state of hydrogen in most of its compounds is except:
A) +1
B) -1
C) 0
D) +2
Answer: B) -1
Q. The oxidation number of oxygen in most compounds is:
A) -2
B) -1
C) +1
D) +2
Answer: A) -2
Q. Which of the following processes involves reduction?
A) Combustion
B) Respiration
C) Photosynthesis
D) Rusting of iron
Answer: C) Photosynthesis
Q. Identify the oxidizing agent in the reaction: Zn + CuSO₄ → ZnSO₄ + Cu.
A) Zn
B) CuSO₄
C) ZnSO₄
D) Cu
Answer: B) CuSO₄
Q. What happens to the oxidation state of an element in a reduction reaction?
A) It increases
B) It decreases
C) It remains the same
D) It becomes zero
Answer: B) It decreases
Q. Which of the following is true for oxidation reactions?
A) Electrons are gained
B) Electrons are lost
C) Protons are gained
D) Neutrons are lost
Answer: B) Electrons are lost
Q. The substance oxidized in the reaction 2Na + Cl₂ → 2NaCl is:
A) Na
B) Cl₂
C) NaCl
D) Both A and B
Answer: A) Na
Q. Balancing the redox reaction by the oxidation number method involves:
A) Equalizing the total charge
B) Equalizing the number of atoms
C) Changing the oxidation numbers
D) Adding H₂O, H⁺, and electrons
Answer: D) Adding H₂O, H⁺, and electrons
Q. What is the oxidation state of chlorine in NaClO₃?
A) -1
B) +1
C) +5
D) +7
Answer: C) +5
Q. In the reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, the reducing agent is:
A) MnO₂
B) HCl
C) MnCl₂
D) H₂O
Answer: B) HCl
Q. Which element is reduced in the following equation: Fe₂O₃ + 3CO → 2Fe + 3CO₂?
A) Fe
B) O
C) C
D) CO
Answer: A) Fe
Q. Determine the reducing agent in the reaction: 2H₂ + O₂ → 2H₂O.
A) H₂
B) O₂
C) H₂O
D) None of the above
Answer: A) H₂
More Resources for Class 11
- NCERT Solutions for Class 11 Chemistry
- NCERT Solutions for Class 11 Physics
- NCERT Solutions for Class 11 Biology
- NCERT Solutions for Class 11 Maths
Q. What is the oxidation state of chromium in K₂Cr₂O₇?
A) +6
B) +3
C) +7
D) +12
Answer: A) +6
Q. In the reaction 2H₂S + SO₂ → 3S + 2H₂O, what is oxidized?
A) H₂S
B) SO₂
C) S
D) H₂O
Answer: A) H₂S
Q. Which of the following is a typical characteristic of redox reactions?
A) Only one reactant undergoes a change in oxidation state
B) They involve transfer of neutrons
C) They do not involve electron transfer
D) They involve changes in oxidation states of reactants
Answer: D) They involve changes in oxidation states of reactants
