Chemical Reaction and Equation Class 10 MCQ with answers for CBSE board exams. Important multiple choice questions with explanations, exam importance, and FAQs.
Introduction
Chemical Reaction and Equation is one of the most important chapters in Class 10 Science. Every year, 2–4 MCQs are directly asked from this chapter in board exams.
To help students revise quickly, this post covers important Chemical Reaction and Equation Class 10 MCQs with answers, exam importance, and FAQs—all in one place.
Whether you are preparing for CBSE Board Exam, school tests, or competitive exams, this post will boost your confidence 💪.
Importance of Chemical Reaction and Equation for Exam
- 📌 High-weightage chapter in CBSE Class 10
- 📌 MCQs are direct and scoring
- 📌 Concepts help in future chemistry chapters
- 📌 Frequently asked in case-based questions
- 📌 Easy to revise using chemical equations
👉 Mastering this chapter can easily fetch full marks in MCQ section.
Chemical Reaction and Equation Class 10 MCQ Quiz
Chemical Reaction and Equation Class 10 MCQ with Answers
1. A chemical reaction involves:
A) Only physical change
B) Formation of new substances
C) Change in size only
D) No energy change
✅ Answer: B) Formation of new substances
2. Which of the following is a chemical reaction?
A) Melting of ice
B) Boiling of water
C) Rusting of iron
D) Dissolving sugar in water
✅ Answer: C) Rusting of iron
3. The chemical equation
Zn + H₂SO₄ → ZnSO₄ + H₂
is an example of:
A) Combination reaction
B) Decomposition reaction
C) Displacement reaction
D) Double displacement reaction
✅ Answer: C) Displacement reaction
4. Which symbol is used to indicate a gas in a chemical equation?
A) (aq)
B) (s)
C) (l)
D) ↑
✅ Answer: D) ↑
5. A reaction in which heat is released is called:
A) Endothermic reaction
B) Exothermic reaction
C) Neutral reaction
D) Oxidation reaction
✅ Answer: B) Exothermic reaction
6. Which of the following is a balanced chemical equation?
A) H₂ + O₂ → H₂O
B) 2H₂ + O₂ → 2H₂O
C) H₂ + O → H₂O
D) H₂ + O₂ → H₂O₂
✅ Answer: B) 2H₂ + O₂ → 2H₂O
7. The process of gaining oxygen is called:
A) Reduction
B) Displacement
C) Oxidation
D) Combination
✅ Answer: C) Oxidation
8. Which reaction involves breaking down of a compound into simpler substances?
A) Combination
B) Decomposition
C) Displacement
D) Redox
✅ Answer: B) Decomposition
9. The reaction AgNO₃ + NaCl → AgCl ↓ + NaNO₃ is an example of:
A) Combination reaction
B) Decomposition reaction
C) Double displacement reaction
D) Oxidation reaction
✅ Answer: C) Double displacement reaction
10. Rusting of iron requires:
A) Oxygen only
B) Water only
C) Oxygen and water
D) Carbon dioxide only
✅ Answer: C) Oxygen and water
Chemical Reaction and Equation Class 10 MCQ (Set 2)
11. Which of the following is an example of a combination reaction?
A) CaCO₃ → CaO + CO₂
B) Zn + CuSO₄ → ZnSO₄ + Cu
C) 2Mg + O₂ → 2MgO
D) AgNO₃ + NaCl → AgCl + NaNO₃
✅ Answer: C) 2Mg + O₂ → 2MgO
12. Which of the following reactions is endothermic?
A) Burning of coal
B) Respiration
C) Decomposition of calcium carbonate
D) Neutralization reaction
✅ Answer: C) Decomposition of calcium carbonate
13. In the reaction CuO + H₂ → Cu + H₂O, hydrogen acts as:
A) Oxidizing agent
B) Reducing agent
C) Catalyst
D) Neutral substance
✅ Answer: B) Reducing agent
14. Which of the following is used to prevent rusting of iron?
A) Painting
B) Galvanization
C) Oiling
D) All of the above
✅ Answer: D) All of the above
15. A reaction in which two solutions react to form an insoluble solid is called:
A) Combination reaction
B) Displacement reaction
C) Precipitation reaction
D) Decomposition reaction
✅ Answer: C) Precipitation reaction
16.Which of the following is not a chemical change?
A) Burning of candle
B) Rusting of iron
C) Cutting of paper
D) Digestion of food
✅ Answer: C) Cutting of paper
17. Which symbol is used to indicate aqueous solution in a chemical equation?
A) (s)
B) (l)
C) (g)
D) (aq)
✅ Answer: D) (aq)
18. Which reaction takes place during photosynthesis?
A) Decomposition reaction
B) Combination reaction
C) Displacement reaction
D) Double displacement reaction
✅ Answer: B) Combination reaction
19. The reaction 2AgCl → 2Ag + Cl₂ in presence of sunlight is an example of:
A) Thermal decomposition
B) Electrolytic decomposition
C) Photochemical decomposition
D) Displacement reaction
✅ Answer: C) Photochemical decomposition
20. Which of the following causes corrosion?
A) Oxidation
B) Reduction
C) Neutralization
D) Combination
✅ Answer: A) Oxidation
Chemical Reaction and Equation Class 10 MCQ (Set 3)
21. Which of the following is a balanced chemical equation?
A) Fe + H₂O → Fe₃O₄ + H₂
B) 3Fe + 4H₂O → Fe₃O₄ + 4H₂
C) Fe + H₂O → FeO + H₂
D) 2Fe + H₂O → Fe₂O₃ + H₂
✅ Answer: B) 3Fe + 4H₂O → Fe₃O₄ + 4H₂
22. The reaction in which a substance gains hydrogen is called:
A) Oxidation
B) Reduction
C) Displacement
D) Decomposition
✅ Answer: B) Reduction
23. Which of the following is an example of corrosion?
A) Burning of magnesium ribbon
B) Rusting of iron
C) Melting of wax
D) Boiling of water
✅ Answer: B) Rusting of iron
24. Which gas is released when a metal reacts with dilute acid?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
✅ Answer: C) Hydrogen
25. Which of the following reactions is used in electric decomposition?
A) Heating
B) Sunlight
C) Electricity
D) Catalyst
✅ Answer: C) Electricity
📌 Tip for Exam:
MCQs from this chapter mostly test:
✔ Reaction types
✔ Oxidation–Reduction
✔ Symbols in equations
✔ Rusting & corrosion
Conclusion
Chemical Reaction and Equation Class 10 MCQs are easy, logical, and highly scoring if practiced properly.
By revising these important MCQs regularly, students can save time in exams and avoid silly mistakes.
📘 Tip: Practice writing balanced equations daily for better accuracy.
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FAQ for Chemical Reaction and Equation Class 10 MCQs
1: How many MCQs are asked from Chemical Reaction and Equation in Class 10?
Usually 2 to 4 MCQs are asked every year in the board exam.
2: Are chemical equations important for MCQs?
Yes, balanced chemical equations are very important and often directly asked.
3: Is this chapter easy to score full marks?
Absolutely! With proper revision and MCQ practice, this is one of the most scoring chapters in Class 10 Science.
