Total Marks: 30 | Total Questions: 20
(Covering Chapters: Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals, Carbon and Its Compounds)
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following is a chemical change?
a) Melting of ice
b) Burning of coal
c) Dissolving sugar in water
d) Boiling of water
2. The chemical formula of washing soda is:
a) Na₂CO₃·10H₂O
b) CaCO₃
c) NaHCO₃
d) MgSO₄
3. Which metal is found in the free state in nature?
a) Copper
b) Sodium
c) Calcium
d) Potassium
4. Which gas is evolved when sodium reacts with ethanol?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen
5. What type of reaction is represented by:
Zn + CuSO₄ → ZnSO₄ + Cu
a) Combination
b) Decomposition
c) Displacement
d) Redox
Section B: Short Answer Questions (2 marks each)
6. Define exothermic and endothermic reactions with examples.
7. What are amphoteric oxides? Give two examples.
8. Why do ionic compounds have high melting points?
9. Explain why carbon can form so many compounds.
10. Write the balanced chemical equation for the reaction between dilute hydrochloric acid and zinc.
Section C: Short Answer Questions (3 marks each)
11. Describe the process of rusting of iron and state two methods to prevent it.
12. Explain the importance of pH in everyday life with examples.
13. Differentiate between saturated and unsaturated hydrocarbons with examples.
14. How is baking soda prepared? Write its chemical formula and two uses.
15. Explain the electrolytic refining of copper.
Section D: Long Answer Questions (5 marks each)
16. Discuss the preparation, properties, and uses of ethanoic acid.
17. Explain the reactivity series of metals and its significance in extraction processes.
This paper provides a comprehensive assessment of the chapters mentioned and covers conceptual, application-based, and analytical questions.
