Balancing Chemical Equations: 100+ Practice Questions (Basic to Advanced)
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Balancing chemical equations is a crucial concept in chemistry for students preparing for CBSE, ICSE, State Boards, and competitive exams such as JEE, NEET, and MHT-CET. In this post, practice these hand-picked questions — from easy to advanced level!
🔍 What is Balancing a Chemical Equation?
Balancing a chemical reaction means ensuring that the number of atoms of each element is equal on both sides of the equation.
Unbalanced: H₂ + O₂ → H₂O
Balanced: 2H₂ + O₂ → 2H₂O
how to balance chemical equations step by step
🛠️ How to Balance Chemical Equations (Steps)
- Write the unbalanced equation.
- Count atoms on both sides.
- Adjust coefficients (not subscripts).
- Balance hydrogen and oxygen last.
- Use the smallest whole numbers.
💡 Balancing Tips for Quick Solving
- Start with unique atoms.
- Leave H and O for the end.
- Use fractions then multiply.
- Practice daily to improve speed.
🟢 Section A: Basic Level Practice (Class 7–10)
Balance the following equations:
__ H₂ + __ O₂ → __ H₂O
__ Na + __ Cl₂ → __ NaCl
__ Ca + __ H₂O → __ Ca(OH)₂ + __ H₂
__ Fe + __ O₂ → __ Fe₂O₃
__ Mg + __ O₂ → __ MgO
__ Al + __ Br₂ → __ AlBr₃
__ Zn + __ HCl → __ ZnCl₂ + __ H₂
__ C + __ O₂ → __ CO₂
__ N₂ + __ H₂ → __ NH₃
__ AgNO₃ + __ NaCl → __ AgCl + __ NaNO₃
balancing equations with answers
2H₂ + O₂ → 2H₂O
2Na + Cl₂ → 2NaCl
Ca + 2H₂O → Ca(OH)₂ + H₂
4Fe + 3O₂ → 2Fe₂O₃
2Mg + O₂ → 2MgO
2Al + 3Br₂ → 2AlBr₃
Zn + 2HCl → ZnCl₂ + H₂
C + O₂ → CO₂
N₂ + 3H₂ → 2NH₃
AgNO₃ + NaCl → AgCl + NaNO₃
🟡 Section B: Intermediate Level Practice (Class 10–12)
Balance the following equations:
__ HCl + __ Ca(OH)₂ → __ CaCl₂ + __ H₂O
__ NaOH + __ H₂SO₄ → __ Na₂SO₄ + __ H₂O
__ NH₃ + __ O₂ → __ NO + __ H₂O
__ KClO₃ → __ KCl + __ O₂
__ Pb(NO₃)₂ → __ PbO + __ NO₂ + __ O₂
__ C₃H₈ + __ O₂ → __ CO₂ + __ H₂O
__ Na + __ H₂O → __ NaOH + __ H₂
__ H₂SO₄ + __ NaOH → __ Na₂SO₄ + __ H₂O
__ CaCO₃ → __ CaO + __ CO₂
__ Fe₂O₃ + __ CO → __ Fe + __ CO₂
🟡 Section C: Practice Level 3 (Class 7–12)
Balance the following equations:
__ H₂ + __ N₂ → __ NH₃
__ Cu + __ AgNO₃ → __ Cu(NO₃)₂ + __ Ag
__ SO₂ + __ O₂ → __ SO₃
__ CH₄ + __ O₂ → __ CO₂ + __ H₂O
__ Ca + __ N₂ → __ Ca₃N₂
__ Al + __ HCl → __ AlCl₃ + __ H₂
__ FeS + __ O₂ → __ Fe₂O₃ + __ SO₂
__ NaHCO₃ → __ Na₂CO₃ + __ CO₂ + __ H₂O
__ P + __ O₂ → __ P₂O₅
__ H₂O₂ → __ H₂O + __ O₂
Balancing Chemical Equations: 100+ Practice Questions (Basic to Advanced)
📥 Download Worksheet (PDF)
✅ Conclusion
Balancing equations is not hard—it just needs regular practice. Whether you're in school or preparing for entrance exams, bookmark this post and solve a few questions every day!
🔁 Share this with classmates and friends who love chemistry!
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