10TH CBSE SCIENCE Chemical Reactions - QUIZ 1

🧪 Chemical Reactions

10 MCQ Test | Class 10 Science

Choose one answer for each question and submit the test.

1. Which of the following is an endothermic reaction?

A. Burning of a candle B. Decomposition of calcium carbonate to form quicklime and carbon dioxide C. Respiration D. Reaction of quicklime with water

2. Iron nails are dipped in copper sulphate solution. What colour change is observed?

A. Colourless to light green B. Blue to light green C. Blue to colourless D. Green to blue

3. When sodium hydrogen carbonate reacts with ethanoic acid, which gas is evolved?

A. Oxygen B. Hydrogen C. Carbon dioxide D. Nitrogen

4. Mg + 2HCl → MgCl₂ + H₂ is an example of which type of reaction?

A. Double displacement reaction B. Displacement reaction C. Decomposition reaction D. Combination reaction

5. In a double displacement reaction between sodium sulphate and barium chloride, what is formed as a precipitate?

A. Sodium chloride B. Barium sulphate C. Sodium sulphate D. Barium chloride

6. What happens when potassium iodide solution is added to lead nitrate solution?

A. A yellow precipitate of lead iodide is formed B. A white precipitate of silver iodide is formed C. No reaction takes place D. A blue precipitate is formed

7. Which statement correctly describes an exothermic reaction?

A. It absorbs heat from the surroundings B. It releases heat to the surroundings C. It always produces a gas D. It always forms a precipitate

8. Which of the following is a combination reaction?

A. C + O₂ → CO₂ B. CaCO₃ → CaO + CO₂ C. Zn + CuSO₄ → ZnSO₄ + Cu D. AgCl → Ag + Cl₂

9. Rust is chemically described as:

A. Hydrated ferrous oxide B. Hydrated ferric oxide C. Pure ferric oxide only D. Ferrous sulphate

10. What are the numbers that cannot be changed while balancing a chemical equation?

A. Coefficients B. Products C. Reactants D. Subscripts

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