10TH CBSE SCIENCE Chemical Reactions - QUIZ 3

🧪 Chemical Reactions & Equations

Fresh Set – 10 Different MCQs

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1. Which of the following is a combination reaction?

A. CaCO₃ → CaO + CO₂ B. Zn + CuSO₄ → ZnSO₄ + Cu C. C + O₂ → CO₂ D. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

2. What happens when zinc is added to copper sulphate solution?

A. Zinc displaces copper B. Copper displaces zinc C. A decomposition reaction occurs D. No reaction occurs

3. Which substance is responsible for the grey colour formed when silver chloride is exposed to sunlight?

A. Chlorine B. Silver C. Oxygen D. Silver oxide

4. Which reaction is an example of a double displacement reaction?

A. Zn + CuSO₄ → ZnSO₄ + Cu B. C + O₂ → CO₂ C. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl D. 2AgCl → 2Ag + Cl₂

5. What is the main purpose of adding common salt during saponification?

A. To increase acidity B. To favour precipitation of soap C. To produce carbon dioxide D. To cool the reaction mixture

6. Which of the following processes is endothermic?

A. Respiration B. Burning of a candle C. Evaporation of water D. Reaction of quicklime with water

7. What is the correct classification of the thermal decomposition of ferrous sulphate?

A. Combination only B. Decomposition and redox C. Neutralisation only D. Double displacement and precipitation

8. Which gas is used to prevent rancidity in packaged food such as potato chips?

A. Oxygen B. Nitrogen C. Hydrogen D. Chlorine

9. In the reaction 2FeCl₂ + Cl₂ → 2FeCl₃, chlorine acts as:

A. Reducing agent B. Oxidising agent C. Catalyst D. Solvent

10. Which observation confirms that a chemical reaction has occurred when iron nails are placed in copper sulphate solution?

A. The blue solution becomes light green B. The solution becomes completely black C. No colour change occurs D. The solution turns orange

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