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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 double displacement reactions, oxidation, reduction, galvanization, and reaction identification with detailed step-by-step solutions for CBSE, State Board, Olympiad, and scholarship exams.
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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 transformation of reactants into products with different properties. These reactions occur in laboratories, industries, and everyday life. Understanding how substances interact and change helps students build a strong foundation in chemistry and scientific reasoning.
What You Will Learn
✔ Double displacement reactions
✔ Oxidation and reduction processes
✔ Galvanization
✔ Characteristics of chemical reactions
✔ Chemical equation analysis
✔ Applications of chemical reactions
✔ Concept-based problem solving
Why This Topic Is Important?
This chapter introduces fundamental chemical concepts that are used throughout higher classes. Understanding reaction mechanisms helps students solve board examination questions and relate chemistry to real-world situations such as corrosion prevention and industrial production.
1. MCQ Questions with Detailed Solutions
Q1. Which of the following is a double displacement reaction?
A) $$Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$$
B) $$CaCO_3 \rightarrow CaO + CO_2$$
C) $$BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl$$
D) $$2Mg + O_2 \rightarrow 2MgO$$
Answer
C) $$BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl$$
Concept Behind This Question
Double displacement reactions involve the exchange of ions between two compounds.
Step-by-Step Solution
In the reaction:
$$BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl$$
Barium and sodium exchange partners.
This ion exchange is characteristic of a double displacement reaction.
Exam Tip
Look for reactions where two compounds exchange ions to form new compounds.
Q2. Which substance is reduced in the following reaction?
$$PbO + C \rightarrow Pb + CO$$
A) Carbon
B) Lead Oxide
C) Carbon Monoxide
D) Lead
Answer
B) Lead Oxide
Useful Concept for this Question
Reduction means removal of oxygen.
Step-by-Step Solution
Lead oxide loses oxygen:
$$PbO \rightarrow Pb$$
Since oxygen is removed from lead oxide, reduction occurs.
Therefore, lead oxide is reduced.
Exam Tip
Removal of oxygen always indicates reduction.
Q3. Galvanization is the process of coating iron with:
A) Copper
B) Aluminium
C) Zinc
D) Silver
Answer
C) Zinc
Concept Behind This Question
Galvanization protects iron from rusting.
Step-by-Step Solution
A thin layer of zinc is applied to iron.
This zinc coating prevents contact between iron and moisture.
As a result, rusting is prevented.
Therefore, the correct answer is zinc.
Exam Tip
Galvanization is one of the most important rust-prevention techniques.
Q4. Which of the following reactions involves a colour change?
A) Iron nail placed in copper sulphate solution
B) Melting of ice
C) Boiling of water
D) Dissolving sugar in water
Answer
A) Iron nail placed in copper sulphate solution
Concept Behind This Question
Colour change is often an indicator of a chemical reaction.
Step-by-Step Solution
Copper sulphate solution is blue.
When an iron nail is placed in it:
$$Fe + CuSO_4 \rightarrow FeSO_4 + Cu$$
The solution gradually changes from blue to green.
Therefore, a colour change occurs.
Exam Tip
Colour change is one of the easiest ways to identify a chemical reaction.
Q5. Which of the following is NOT a chemical reaction?
A) Rusting of iron
B) Burning of magnesium ribbon
C) Digestion of food
D) Melting of wax
Answer
D) Melting of wax
Concept Behind This Question
Physical changes do not produce new substances.
Step-by-Step Solution
Rusting, burning, and digestion produce new substances.
Melting of wax only changes its physical state.
No new substance is formed.
Therefore, melting of wax is not a chemical reaction.
Exam Tip
If no new substance is formed, the change is usually physical.
Important Formulas & Concepts
1. Double Displacement Reaction
$$AB + CD \rightarrow AD + CB$$
Two compounds exchange ions.
2. Reduction
Removal of oxygen or addition of hydrogen.
3. Oxidation
Addition of oxygen or removal of hydrogen.
4. Galvanization
Coating iron with zinc to prevent rusting.
5. Chemical Change
A process that forms one or more new substances.
Related Practice Questions
- What is a double displacement reaction?
- Define oxidation and reduction.
- Why is zinc used in galvanization?
- What are the indicators of a chemical reaction?
- How can physical changes be distinguished from chemical changes?
Mini Quiz Challenge
Fill in the blanks
- Galvanization uses a coating of __________.
- Removal of oxygen is called __________.
- A double displacement reaction involves exchange of __________.
Answers
- Zinc
- Reduction
- Ions
Exam Tips
✔ Learn definitions of oxidation and reduction carefully.
✔ Revise common examples of double displacement reactions.
✔ Remember rust-prevention methods.
✔ Identify signs of chemical reactions.
✔ Practice distinguishing physical and chemical changes.
Quick Revision Notes
✔ Double displacement reactions involve ion exchange.
✔ Lead oxide is reduced when oxygen is removed.
✔ Zinc is used in galvanization.
✔ Colour change may indicate a chemical reaction.
✔ Melting of wax is a physical change.
✔ Rusting and burning are chemical changes.
✔ Chemical reactions produce new substances.
Common Mistakes Students Make
❌ Confusing physical changes with chemical changes.
❌ Forgetting that reduction means removal of oxygen.
❌ Mixing displacement and double displacement reactions.
❌ Assuming every colour change is a physical process.
❌ Ignoring the role of zinc in galvanization.
Key Takeaways
✔ Double displacement reactions involve exchange of ions.
✔ Reduction occurs when oxygen is removed.
✔ Zinc protects iron through galvanization.
✔ Colour changes often indicate chemical reactions.
✔ Physical changes do not produce new substances.
✔ Understanding reaction types improves conceptual clarity.
FAQs
1. What is a double displacement reaction?
A reaction in which two compounds exchange ions to form new compounds.
2. What is galvanization?
The process of coating iron with zinc to prevent rusting.
3. What is reduction?
Removal of oxygen or addition of hydrogen.
4. Is melting of wax a chemical change?
No, it is a physical change.
5. Why is colour change important in chemistry?
Because it often indicates that a chemical reaction has occurred.
Conclusion
Chemical reactions can be identified through observable changes such as colour change, gas evolution, and precipitate formation. Understanding double displacement reactions, reduction, galvanization, and physical versus chemical changes helps students strengthen their chemistry concepts and improve examination performance.
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