Chemical Reactions and Equations Important Questions – Class 10 Chemistry
This article provides important questions from Chemical Reactions and Equations chapter for CBSE Class 10 students. These questions are board exam oriented and include balanced chemical equations, corrosion, and precipitation reactions.
1. What is a Chemical Reaction?
Definition: A chemical reaction is a process in which reactants undergo a chemical change to form new substances called products with different properties.
2. What is Corrosion?
Definition: Corrosion is the slow destruction of metals due to reaction with air and moisture.
Rusting Equation:
4Fe + 3O2 + H2O → 2Fe2O3
Prevention of Corrosion
- Painting
- Oiling and Greasing
- Galvanization
- Electroplating
- Alloy formation
3. What is a Precipitation Reaction?
Definition: A precipitation reaction is a double displacement reaction in which an insoluble solid called precipitate is formed.
Example:
AgNO3 + NaCl → AgCl ↓ + NaNO3
4. Balance the Following Equations
(i) Al + O2 → Al2O3
Balanced Equation:
4Al + 3O2 → 2Al2O3
(ii) Fe + H2O → Fe3O4 + H2
Balanced Equation:
3Fe + 4H2O → Fe3O4 + 4H2
5. Important Board Exam Questions
- State the Law of Conservation of Mass.
- What are indicators of chemical reactions?
- Define rancidity with example.
- Explain types of chemical reactions with examples.
Frequently Asked Questions (FAQs)
Why is balancing chemical equations important?
Balancing ensures that the law of conservation of mass is followed.
Which reaction is exothermic?
Reactions that release heat energy, such as combustion reactions.
What is rusting?
Rusting is the formation of iron oxide when iron reacts with oxygen and water.
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Conclusion
These important questions from Chemical Reactions and Equations are essential for scoring high marks in Class 10 board exams. Practice balanced equations and understand corrosion and precipitation reactions thoroughly.
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