IIT JEE Chemistry Practice Paper – Part 7 – Redox Reactions – PYQs

IIT JEE Chemistry Practice Paper – Previous Years’ Questions

Part 7: Redox Reactions

Q1. In the reaction: Zn + CuSO₄ → ZnSO₄ + Cu, which element is oxidized?

a) Cu
b) Zn
c) S
d) O

Q2. In which of the following reactions is H₂O₂ acting as an oxidizing agent?

a) 2H₂O₂ → 2H₂O + O₂
b) H₂O₂ + 2KI + H₂SO₄ → I₂ + 2H₂O + K₂SO₄
c) H₂O₂ + Na₂SO₃ → Na₂SO₄ + H₂O
d) H₂O₂ + Cl₂ → 2HCl + O₂

Q3. The oxidation number of Cr in K₂Cr₂O₇ is:

a) +2
b) +3
c) +6
d) +7

Q4. Which of the following is a disproportionation reaction?

a) Cl₂ + 2OH⁻ → Cl⁻ + ClO⁻ + H₂O
b) Zn + Cu²⁺ → Zn²⁺ + Cu
c) Fe²⁺ + MnO₄⁻ → Fe³⁺ + Mn²⁺
d) Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

Q5. Which of the following statements about oxidizing agents is correct?

a) They undergo reduction
b) They undergo oxidation
c) They always contain oxygen
d) They always contain halogens

Q6. The change in oxidation number of Mn in KMnO₄ when it acts as an oxidizing agent in acidic medium is:

a) +7 to +2
b) +7 to +4
c) +7 to +6
d) +7 to +5

Q7. In the reaction: 2FeCl₃ + SnCl₂ → 2FeCl₂ + SnCl₄, the reducing agent is:

a) FeCl₃
b) SnCl₂
c) FeCl₂
d) SnCl₄

Q8. Which of the following reactions is NOT a redox reaction?

a) CaCO₃ → CaO + CO₂
b) 2Mg + O₂ → 2MgO
c) Zn + 2HCl → ZnCl₂ + H₂
d) Fe²⁺ + Cl₂ → Fe³⁺ + 2Cl⁻

Q9. In acidic medium, MnO₂ acts as an oxidizing agent and changes into:

a) Mn²⁺
b) Mn³⁺
c) MnO₄⁻
d) Mn

Q10. In which of the following is the oxidation number of nitrogen highest?

a) NH₃
b) NO₂
c) HNO₃
d) N₂

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These IIT JEE Chemistry practice quizzes are highly useful for students as they provide structured, exam-oriented preparation. Each quiz is topic-specific, allowing aspirants to revise one concept at a time and strengthen their weak areas. The format follows the real JEE exam pattern, with multiple-choice questions and negative marking awareness, which helps students build accuracy and time management skills. Detailed explanations after every question enhance conceptual clarity and prevent repetitive mistakes. Since the quizzes are self-evaluating, students can measure progress instantly and adapt their study strategy accordingly, ensuring consistent improvement and confidence for IIT JEE success.