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🧾 CBSE · Class 10

Class 10 Science: Chemical Reactions and Equations Worksheet (with Answers)

A free, print-ready worksheet on Chemical Reactions and Equations for CBSE Class 10 Science, with a matching answer key. Use the sample below, or build your own with the exact mix of questions you need — no login, no ads.

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Sample worksheet

7 of 20 questions from this chapter. Generate your own for the full set, more variations, and a clean print layout.

  1. 1. A balanced chemical equation obeys the law of:
    • (a) definite volumes
    • (b) multiple proportions
    • (c) constant proportions
    • (d) conservation of mass
  2. 2. 2Mg + O₂ → 2MgO is an example of a:
    • (a) double displacement reaction
    • (b) decomposition reaction
    • (c) combination reaction
    • (d) displacement reaction
  3. 3. CaCO₃ → CaO + CO₂ on heating is a:
    • (a) neutralisation
    • (b) displacement reaction
    • (c) combination reaction
    • (d) decomposition reaction
  4. 4. Fe + CuSO₄ → FeSO₄ + Cu is a:
    • (a) displacement reaction
    • (b) combination reaction
    • (c) double displacement reaction
    • (d) decomposition reaction
  5. 5. Why must a chemical equation be balanced?
  6. 6. Give one example of a combination reaction.
  7. 7. Define and give one example each of displacement and double displacement reactions.
View answers
  1. 1. (d) conservation of mass — Equal atoms on both sides reflect conservation of mass.
  2. 2. (c) combination reaction — Two substances combine to form one product.
  3. 3. (d) decomposition reaction — One compound splits into two — decomposition.
  4. 4. (a) displacement reaction — More reactive iron displaces copper — displacement.
  5. 5. To satisfy the law of conservation of mass — atoms are neither created nor destroyed in a reaction.
  6. 6. C + O₂ → CO₂ (carbon burns in oxygen to form carbon dioxide).
  7. 7. Displacement: a more reactive element replaces a less reactive one, e.g. Zn + CuSO₄ → ZnSO₄ + Cu. Double displacement: two compounds exchange ions, e.g. AgNO₃ + NaCl → AgCl↓ + NaNO₃, forming a precipitate of silver chloride.
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FAQ

Is this Class 10 Science worksheet on Chemical Reactions and Equations free?
Yes — it is completely free, with no login and no ads. You can print it or save it as a PDF, and generate unlimited variations.
Does the Chemical Reactions and Equations worksheet come with answers?
Yes. Every worksheet has a separate answer key with the correct answers, short explanations and marks, so it is ready for marking.
Can I choose how many questions and which types?
Yes. Open the generator for this chapter and set how many MCQs, short, long and HOTS questions you want; totals and marks update live, and you can swap any single question.
Which board and class is this for?
This worksheet is aligned to CBSE Class 10 Science, chapter “Chemical Reactions and Equations”.