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Practice Class 10 Science Chapter 1 Chemical Reactions and Equations MCQ Questions with Answers based on the latest NCERT syllabus. Solve advanced MCQs on reaction classification, oxidation, reduction, corrosion, and chemical equation concepts with detailed solutions for CBSE, State Board, Olympiad, and scholarship exam preparation.
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Chapter Information
Subject: Science
Class: 10
Chapter: Chemical Reactions and Equations
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Moderate to Difficult
Based On: NCERT Latest Syllabus (2026)
Introduction
Chemical reactions involve the rearrangement of atoms to form new substances. By studying different reaction types and their characteristics, students can understand how chemistry explains natural events, industrial processes, and daily-life phenomena.
What You Will Learn
✔ Reaction classification
✔ Oxidation and reduction
✔ Corrosion and prevention
✔ Chemical equation interpretation
✔ Real-life applications of reactions
✔ NCERT-based concepts
✔ Analytical problem-solving
Why This Topic Is Important?
The concepts of oxidation, reduction, corrosion, and reaction classification form the foundation of chemistry. Questions from these topics are frequently asked in school examinations, board exams, Olympiads, and scholarship tests.
1. MCQ Questions with Detailed Solutions
Q1. Which of the following is a combination reaction?
A) $$2H_2 + O_2 \rightarrow 2H_2O$$
B) $$CaCO_3 \rightarrow CaO + CO_2$$
C) $$Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$$
D) $$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$$
Answer
A) $$2H_2 + O_2 \rightarrow 2H_2O$$
Concept Behind This Question
In a combination reaction, two or more reactants combine to form a single product.
Step-by-Step Solution
Hydrogen and oxygen combine to form water:
$$2H_2 + O_2 \rightarrow 2H_2O$$
Only one product is formed.
Therefore, it is a combination reaction.
Exam Tip
One product from multiple reactants generally indicates a combination reaction.
Q2. Which substance is oxidized in the following reaction?
$$2CO + O_2 \rightarrow 2CO_2$$
A) Oxygen
B) Carbon Monoxide
C) Carbon Dioxide
D) None of these
Answer
B) Carbon Monoxide
Useful Concept for this Question
Oxidation means gain of oxygen.
Step-by-Step Solution
Carbon monoxide gains oxygen and becomes carbon dioxide:
$$CO \rightarrow CO_2$$
Therefore, carbon monoxide is oxidized.
Exam Tip
Whenever oxygen is added to a substance, oxidation occurs.
Q3. Which of the following metals is commonly protected by galvanization?
A) Copper
B) Aluminium
C) Iron
D) Silver
Answer
C) Iron
Concept Behind This Question
Galvanization protects iron from rusting.
Step-by-Step Solution
A zinc coating is applied to iron surfaces.
This prevents contact with air and moisture.
Therefore, galvanization is mainly used for iron.
Exam Tip
Remember: Iron + Zinc coating = Galvanization.
Q4. Which of the following is a chemical change?
A) Breaking glass
B) Melting ice
C) Boiling water
D) Burning paper
Answer
D) Burning paper
Concept Behind This Question
Chemical changes produce new substances.
Step-by-Step Solution
Burning paper produces:
• Ash
• Smoke
• Gases
New substances are formed.
Therefore, burning paper is a chemical change.
Exam Tip
If a new substance is formed, the change is chemical.
Q5. Which statement about corrosion is correct?
A) It improves metal strength.
B) It only occurs in plastics.
C) It gradually damages metals.
D) It is a physical change.
Answer
C) It gradually damages metals.
Concept Behind This Question
Corrosion is a chemical process that weakens metals.
Step-by-Step Solution
Corrosion occurs when metals react with environmental substances such as oxygen and moisture.
Examples:
• Rusting of iron
• Tarnishing of silver
Thus, corrosion damages metals over time.
Exam Tip
Corrosion reduces the life and strength of metal objects.
Important Formulas & Concepts
1. Combination Reaction
$$A + B \rightarrow AB$$
Two or more reactants form one product.
2. Oxidation
Addition of oxygen or removal of hydrogen.
3. Reduction
Removal of oxygen or addition of hydrogen.
4. Galvanization
Protecting iron by coating it with zinc.
5. Corrosion
Gradual deterioration of metals due to chemical reactions with the environment.
Related Practice Questions
- What is a combination reaction?
- Define oxidation with an example.
- Why is galvanization important?
- What is corrosion?
- Give one example of a chemical change.
Mini Quiz Challenge
Fill in the blanks
- Galvanization uses a coating of __________.
- Gain of oxygen is called __________.
- Burning paper is a __________ change.
Answers
- Zinc
- Oxidation
- Chemical
Exam Tips
✔ Learn all reaction types with examples.
✔ Revise oxidation and reduction carefully.
✔ Understand corrosion prevention methods.
✔ Practice identifying chemical and physical changes.
✔ Focus on NCERT in-text reactions.
Quick Revision Notes
✔ Combination reactions produce a single product.
✔ Carbon monoxide is oxidized to carbon dioxide.
✔ Iron is protected through galvanization.
✔ Burning paper is a chemical change.
✔ Corrosion damages metals gradually.
✔ Zinc helps prevent rusting.
✔ Oxidation involves gain of oxygen.
Common Mistakes Students Make
❌ Confusing physical changes with chemical changes.
❌ Forgetting the definition of oxidation.
❌ Mixing galvanization with painting.
❌ Assuming corrosion is a physical process.
❌ Ignoring reaction classification.
Key Takeaways
✔ Combination reactions form a single product.
✔ Oxidation involves gain of oxygen.
✔ Galvanization protects iron from rusting.
✔ Chemical changes produce new substances.
✔ Corrosion weakens metals over time.
✔ Understanding reaction types improves exam performance.
FAQs
1. What is a combination reaction?
A reaction in which two or more reactants form a single product.
2. What is oxidation?
Addition of oxygen or removal of hydrogen.
3. What is galvanization?
Coating iron with zinc to prevent rusting.
4. Is burning paper a chemical change?
Yes, because new substances are formed.
5. Why is corrosion harmful?
Because it weakens and damages metal objects.
Conclusion
Chemical reactions explain many important changes occurring around us. Understanding oxidation, corrosion, galvanization, and reaction classification helps students strengthen their chemistry concepts and prepare effectively for examinations.
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