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Introduction Paragraph
Redox Reactions and Oxidation Numbers form one of the most fundamental concepts in Inorganic Chemistry (Chapter 8) for CBSE Class 11 students. These concepts help students understand how chemical reactions involve the transfer of electrons, oxidation, and reduction processes, which are crucial for understanding chemical bonding, electrochemistry, and corrosion.
This online MCQ practice test on Redox Reactions and Oxidation Numbers is designed strictly according to the NCERT Class 11 Chemistry syllabus and the CBSE Board examination pattern. It includes a mix of conceptual, numerical, and reasoning-based questions that test your grasp of oxidation states, balancing redox equations, and identification of oxidizing and reducing agents.
Each question is accompanied by instant feedback and a detailed explanation, making it ideal for revision and self-assessment. Attempt this 30-question timed quiz to evaluate your preparation and build strong fundamentals in Inorganic Chemistry for Class 11 and competitive exams like JEE and NEET.
Sample MCQs (with Answers and Explanations)
Q1. In the reaction Zn + CuSO₄ → ZnSO₄ + Cu, which species is oxidized?
A) Cu B) Zn C) SO₄²⁻ D) None
Answer: B) Zn
Explanation: Zinc loses two electrons to form Zn²⁺ (oxidized), while Cu²⁺ gains electrons and is reduced.
Q2. The oxidation number of sulfur in H₂SO₄ is:
A) +4 B) +6 C) -2 D) 0
Answer: B) +6
Explanation: Let oxidation number of sulfur = x → 2(+1) + x + 4(-2) = 0 → x = +6.
Q3. Which of the following is not a redox reaction?
A) HCl + NaOH → NaCl + H₂O B) Zn + CuSO₄ → ZnSO₄ + Cu
C) 2H₂O₂ → 2H₂O + O₂ D) 2Fe + O₂ → 2FeO
Answer: A) HCl + NaOH → NaCl + H₂O
Explanation: This is an acid-base neutralization reaction with no change in oxidation states.
Q4. The oxidizing agent in the reaction: 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl⁻ is:
A) Fe²⁺ B) Cl₂ C) Fe³⁺ D) Cl⁻
Answer: B) Cl₂
Explanation: Cl₂ gains electrons to form Cl⁻ (reduced), acting as the oxidizing agent.
Q5. Oxidation number of oxygen in OF₂ is:
A) -2 B) -1 C) +2 D) 0
Answer: C) +2
Explanation: Fluorine is more electronegative (−1 each), so oxygen must be +2 to balance the compound.
✅ Highlight:
These MCQs are designed strictly as per the NCERT syllabus for CBSE Class 11 Chemistry, ensuring accuracy, conceptual clarity, and exam relevance for both board exams and competitive tests.