“Class 10 Science Chapter 1 MCQs | Most Repeated Chemical Reactions & Equations Questions with Answers”

 “Class 10 Science Chapter 1 MCQs | Most Repeated Chemical Reactions & Equations Questions with Answers”

Preparing for Class 10 Science exams? Chapter 1 – Chemical Reactions and Equations is one of the most important topics, and students often face repeated MCQs from this section in board exams and competitive tests. On MCQJourney.com, we bring you the most repeated Class 10 Science Chapter 1 MCQs with answers, carefully selected to boost your exam preparation. These questions cover essential concepts like oxidation, reduction, types of chemical reactions, balancing equations, and practical applications. Whether you are revising for CBSE, ICSE, State Boards, NTSE, or other competitive exams, these MCQs will help you strengthen your understanding and score higher. Practice these exam-focused MCQs to improve speed, accuracy, and confidence. Bookmark this page and share it with your friends to stay ahead in your preparation. With keyword-optimized content and clear explanations, this post is your one-stop solution for mastering Class 10 Science Chapter 1.

MCQs with Answers

1. Which of the following is a balanced chemical equation?

   • (A) H₂ + O₂ → H₂O

   • (B) 2H₂ + O₂ → 2H₂O ✅

   • (C) H₂ + O₂ → 2H₂O

   • (D) 2H₂ + 2O₂ → 2H₂O

2. Which reaction is an example of decomposition?

   • (A) 2Mg + O₂ → 2MgO

   • (B) 2KClO₃ → 2KCl + 3O₂ ✅

   • (C) Zn + HCl → ZnCl₂ + H₂

   • (D) NaOH + HCl → NaCl + H₂O

3. Rusting of iron is an example of:

   • (A) Reduction

   • (B) Oxidation ✅

   • (C) Neutralization

   • (D) Double displacement

4. Which gas is released when zinc reacts with dilute HCl?

   • (A) Oxygen

   • (B) Hydrogen ✅

   • (C) Nitrogen

   • (D) Carbon dioxide

5. Which of the following is a redox reaction?

   • (A) NaOH + HCl → NaCl + H₂O

   • (B) Zn + CuSO₄ → ZnSO₄ + Cu ✅

   • (C) CaCO₃ → CaO + CO₂

   • (D) AgNO₃ + NaCl → AgCl + NaNO₃

6. Which reaction produces a precipitate?

   • (A) NaOH + HCl → NaCl + H₂O

   • (B) AgNO₃ + NaCl → AgCl (ppt) + NaNO₃ ✅

   • (C) Zn + HCl → ZnCl₂ + H₂

   • (D) 2Mg + O₂ → 2MgO

7. Which of the following is an endothermic reaction?

   • (A) Photosynthesis ✅

   • (B) Combustion of fuel

   • (C) Respiration

   • (D) Neutralization

8. The reaction 2H₂ + O₂ → 2H₂O is:

   • (A) Combination ✅

   • (B) Decomposition

   • (C) Displacement

   • (D) Double displacement

9. Which chemical equation represents neutralization?

   • (A) NaOH + HCl → NaCl + H₂O ✅

   • (B) Zn + HCl → ZnCl₂ + H₂

   • (C) 2Mg + O₂ → 2MgO

   • (D) CaCO₃ → CaO + CO₂

10. Which of the following is used to prevent rusting?

• (A) Galvanization ✅

• (B) Combustion

• (C) Electrolysis

• (D) Sublimation

11. Which reaction is an example of displacement?

• (A) Zn + CuSO₄ → ZnSO₄ + Cu ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) 2Mg + O₂ → 2MgO

• (D) CaCO₃ → CaO + CO₂

12. Which of the following is a double displacement reaction?

• (A) AgNO₃ + NaCl → AgCl + NaNO₃ ✅

• (B) Zn + HCl → ZnCl₂ + H₂

• (C) 2Mg + O₂ → 2MgO

• (D) CaCO₃ → CaO + CO₂

13. Which reaction is exothermic?

• (A) Combustion of fuel ✅

• (B) Photosynthesis

• (C) Electrolysis of water

• (D) Dissolution of salt

14. Which of the following is a displacement reaction?

• (A) Fe + CuSO₄ → FeSO₄ + Cu ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) 2Mg + O₂ → 2MgO

• (D) CaCO₃ → CaO + CO₂

15. Which of the following is a decomposition reaction?

• (A) CaCO₃ → CaO + CO₂ ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) Zn + HCl → ZnCl₂ + H₂

• (D) 2Mg + O₂ → 2MgO

16. Which of the following is an oxidation reaction?

• (A) 2Mg + O₂ → 2MgO ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) Zn + HCl → ZnCl₂ + H₂

• (D) AgNO₃ + NaCl → AgCl + NaNO₃

17. Which of the following is reduction?

• (A) CuO + H₂ → Cu + H₂O ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) 2Mg + O₂ → 2MgO

• (D) CaCO₃ → CaO + CO₂

18. Which of the following is a combination reaction?

• (A) 2Mg + O₂ → 2MgO ✅

• (B) CaCO₃ → CaO + CO₂

• (C) Zn + HCl → ZnCl₂ + H₂

• (D) AgNO₃ + NaCl → AgCl + NaNO₃

19. Which of the following is a displacement reaction?

• (A) Zn + HCl → ZnCl₂ + H₂ ✅

• (B) NaOH + HCl → NaCl + H₂O

• (C) CaCO₃ → CaO + CO₂

• (D) 2Mg + O₂ → 2MgO

20. Which of the following is a neutralization reaction?

• (A) HCl + NaOH → NaCl + H₂O ✅

• (B) Zn + HCl → ZnCl₂ + H₂

• (C) CaCO₃ → CaO + CO₂

• (D) 2Mg + O₂ → 2MgO

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