CLASS 10 SCIENCE – WORKSHEET
Chapter 1: Chemical Reactions and Equations
Name: ______________________________ Class/Section: __________ Date: ______________
Instructions: Attempt all questions. Balance chemical equations wherever required. Write observations and
reaction types clearly.
A. MCQs
1. Which of the following is a chemical change? (a) Melting of ice (b) Cutting paper (c) Rusting of iron (d)
Boiling water
2. The reaction CaO + H₂O → Ca(OH)₂ is a: (a) Decomposition reaction (b) Combination reaction (c)
Displacement reaction (d) Double displacement reaction
3. Which gas is released when zinc reacts with dilute hydrochloric acid? (a) Oxygen (b) Hydrogen (c) Carbon
dioxide (d) Nitrogen
4. In a displacement reaction, a more reactive element: (a) is displaced by a less reactive element (b) displaces
a less reactive element (c) combines with another compound only (d) decomposes into gases
5. The green coating formed on copper is mainly due to: (a) copper oxide only (b) basic copper carbonate (c)
copper sulphate (d) copper chloride
B. Balance the Chemical Equations
6. H₂ + O₂ → H₂O
7. Mg + O₂ → MgO
8. Fe + H₂O → Fe₃O₄ + H₂
9. Zn + HCl → ZnCl₂ + H₂
10. Na₂SO₄ + BaCl₂ → BaSO₄ + NaCl
11. Al + O₂ → Al₂O₃
C. Identify the Type of Reaction
12. CaO + H₂O → Ca(OH)₂
13. 2AgCl → 2Ag + Cl₂
14. Zn + CuSO₄ → ZnSO₄ + Cu
15. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
16. CuO + H₂ → Cu + H₂O
D. Short Answer Questions
17. What is a chemical reaction? Give two signs that indicate that a chemical reaction has occurred.
18. Why should a magnesium ribbon be cleaned before burning?
Chapter 1: Chemical Reactions and Equations
Name: ______________________________ Class/Section: __________ Date: ______________
Instructions: Attempt all questions. Balance chemical equations wherever required. Write observations and
reaction types clearly.
A. MCQs
1. Which of the following is a chemical change? (a) Melting of ice (b) Cutting paper (c) Rusting of iron (d)
Boiling water
2. The reaction CaO + H₂O → Ca(OH)₂ is a: (a) Decomposition reaction (b) Combination reaction (c)
Displacement reaction (d) Double displacement reaction
3. Which gas is released when zinc reacts with dilute hydrochloric acid? (a) Oxygen (b) Hydrogen (c) Carbon
dioxide (d) Nitrogen
4. In a displacement reaction, a more reactive element: (a) is displaced by a less reactive element (b) displaces
a less reactive element (c) combines with another compound only (d) decomposes into gases
5. The green coating formed on copper is mainly due to: (a) copper oxide only (b) basic copper carbonate (c)
copper sulphate (d) copper chloride
B. Balance the Chemical Equations
6. H₂ + O₂ → H₂O
7. Mg + O₂ → MgO
8. Fe + H₂O → Fe₃O₄ + H₂
9. Zn + HCl → ZnCl₂ + H₂
10. Na₂SO₄ + BaCl₂ → BaSO₄ + NaCl
11. Al + O₂ → Al₂O₃
C. Identify the Type of Reaction
12. CaO + H₂O → Ca(OH)₂
13. 2AgCl → 2Ag + Cl₂
14. Zn + CuSO₄ → ZnSO₄ + Cu
15. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
16. CuO + H₂ → Cu + H₂O
D. Short Answer Questions
17. What is a chemical reaction? Give two signs that indicate that a chemical reaction has occurred.
18. Why should a magnesium ribbon be cleaned before burning?
