Chemical Reactions and Equations

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Very Short Answer Questions

1–2 Marks Each

1. What is a chemical reaction?
   Basic Definition
2. What are reactants and products?
   Components of Reaction
3. Write the law of conservation of mass.
   Fundamental Law
4. What is a chemical equation?
   Representation Method
5. Why should a chemical equation be balanced?
   Importance
6. What does the symbol (aq) indicate in a chemical equation?
   Chemical Notation
7. Define oxidation in terms of electrons.
   Electronic Concept
8. Define reduction in terms of oxygen.
   Oxygen Concept
9. What is meant by corrosion?
   Chemical Process
10. What is rancidity?
    Food Chemistry

Short Answer Questions

3–4 Marks Each

1. Write any four characteristics that indicate a chemical reaction.
   Identification Signs
2. Explain the steps involved in balancing a chemical equation.
   Methodology
3. Write the differences between oxidation and reduction.
   Comparative Analysis
4. What is a combination reaction? Give one example.
   Reaction Type with Example
5. Explain decomposition reaction with one suitable example.
   Reaction Type with Example
6. What is a displacement reaction? Write one example.
   Reaction Type with Example
7. Explain double displacement reaction with an example.
   Reaction Type with Example
8. What is a redox reaction? Explain with an example.
   Redox Concept
9. Explain corrosion and mention two methods to prevent it.
   Process & Prevention
10. Explain rancidity and write two methods to prevent it.
    Process & Prevention

Long Answer Questions

5 Marks Each

1. Explain different types of chemical reactions with examples.
   Comprehensive Classification
2. Describe oxidation and reduction reactions. Explain why they always occur together.
   Redox Theory
3. Explain the process of rusting of iron. Mention the conditions required and prevention methods.
   Detailed Process Analysis
4. Write a detailed note on balancing chemical equations with an example.
   Methodical Explanation
5. Explain the effects of oxidation in daily life.
   Real-life Applications

Reasoning / Thinking-Based Questions

Conceptual Understanding

1. Why is respiration considered an exothermic reaction?
   Biological Process Analysis
2. Why are oxidation and reduction inseparable processes?
   Interdependent Concepts
3. Why does iron rust faster in coastal areas?
   Environmental Factors
4. Why is food kept in airtight containers?
   Practical Application
5. Why is galvanization an effective method to prevent rusting?
   Protection Mechanism

Practical / Application-Based Questions

Experimental Focus

1. How will you test the presence of hydrogen gas in a laboratory?
   Laboratory Test
2. How can carbon dioxide gas be identified using lime water?
   Chemical Test
3. Write the chemical reaction involved in the burning of magnesium ribbon.
   Reaction Writing
4. Identify the type of reaction:
   a) CaCO₃ → CaO + CO₂
   b) Zn + CuSO₄ → ZnSO₄ + Cu
   Reaction Identification
5. Identify the oxidizing and reducing agents in a given reaction.
   Agent Identification