30+ Balancing Chemical Equations Practice Questions (With Answers) | Agastya Classes

Master Balancing Chemical Equations | Agastya Classes

Master Balancing Chemical Equations

The Ultimate Practice Guide by Agastya Classes

Why Balancing Equations is Important?

In Chemistry, balancing equations isn't just a math problem; it's a fundamental law of nature. According to the Law of Conservation of Mass, matter cannot be created or destroyed. This means the number of atoms on the reactant side (left) must exactly match the product side (right).

Whether you are in Class 10 preparing for board exams or an aspirant for JEE/NEET, mastering this skill is crucial for scoring high marks.

⚡ 3 Golden Rules for Balancing:

  1. Never change the subscript: Change H2O to 2H2O, NOT H2O2.
  2. Balance Metals First: Look for elements like Fe, Na, Mg, Al first.
  3. Balance Oxygen and Hydrogen Last: These often balance themselves out if you handle the others first.

Ready to test your skills? We have curated 30 interactive questions ranging from easy to expert level. Grab a pen and paper!

🟢 Level 1: Beginner (The Warm Up)

Start with these simple reactions to build your confidence.

1. Formation of Water: H2 + O2 → H2O
Ans: 2H2 + O2 → 2H2O
2. Haber Process (Ammonia): N2 + H2 → NH3
Ans: N2 + 3H2 → 2NH3
3. Burning Magnesium: Mg + O2 → MgO
Ans: 2Mg + O2 → 2MgO
4. Sodium and Chlorine: Na + Cl2 → NaCl
Ans: 2Na + Cl2 → 2NaCl
5. Water Decomposition: H2O → H2 + O2
Ans: 2H2O → 2H2 + O2
6. Potassium and Chlorine: K + Cl2 → KCl
Ans: 2K + Cl2 → 2KCl
7. Silver Oxide Breakdown: Ag2O → Ag + O2
Ans: 2Ag2O → 4Ag + O2
8. Sulfur burning: S8 + O2 → SO2
Ans: S8 + 8O2 → 8SO2
9. Zinc and Hydrochloric Acid: Zn + HCl → ZnCl2 + H2
Ans: Zn + 2HCl → ZnCl2 + H2
10. Sodium in Water: Na + H2O → NaOH + H2
Ans: 2Na + 2H2O → 2NaOH + H2
🟡 Level 2: Intermediate (Board Exam Level)

Perfect for Class 10 practice. These involve polyatomic ions and combustion.

1. Combustion of Methane (Natural Gas): CH4 + O2 → CO2 + H2O
Ans: CH4 + 2O2 → CO2 + 2H2O
2. Iron reacting with Steam (Rusting): Fe + H2O → Fe3O4 + H2
Ans: 3Fe + 4H2O → Fe3O4 + 4H2
3. Photosynthesis: CO2 + H2O → C6H12O6 + O2
Ans: 6CO2 + 6H2O → C6H12O6 + 6O2
4. Aluminum + HCl: Al + HCl → AlCl3 + H2
Ans: 2Al + 6HCl → 2AlCl3 + 3H2
5. Acid Base Reaction: NaOH + H2SO4 → Na2SO4 + H2O
Ans: 2NaOH + H2SO4 → Na2SO4 + 2H2O
6. Combustion of Propane: C3H8 + O2 → CO2 + H2O
Ans: C3H8 + 5O2 → 3CO2 + 4H2O
7. Decomposition of Potassium Chlorate: KClO3 → KCl + O2
Ans: 2KClO3 → 2KCl + 3O2
8. Phosphorus burning: P4 + O2 → P2O5
Ans: P4 + 5O2 → 2P2O5
9. Iron extraction: Fe2O3 + CO → Fe + CO2
Ans: Fe2O3 + 3CO → 2Fe + 3CO2
10. Sulfur Dioxide oxidation: SO2 + O2 → SO3
Ans: 2SO2 + O2 → 2SO3
🔴 Level 3: Advanced (Chemistry Wizards)

Challenge yourself! These questions appear in competitive exams.

1. Combustion of Butane (LPG): C4H10 + O2 → CO2 + H2O
Ans: 2C4H10 + 13O2 → 8CO2 + 10H2O
2. Lead Nitrate Decomposition: Pb(NO3)2 → PbO + NO2 + O2
Ans: 2Pb(NO3)2 → 2PbO + 4NO2 + O2
3. Copper + Nitric Acid: Cu + HNO3 → Cu(NO3)2 + NO2 + H2O
Ans: Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O
4. Thermite Reaction (Welding): Fe2O3 + Al → Al2O3 + Fe
Ans: Fe2O3 + 2Al → Al2O3 + 2Fe
5. Chlorine gas preparation: KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2
Ans: 2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 8H2O + 5Cl2
6. Combustion of Benzene: C6H6 + O2 → CO2 + H2O
Ans: 2C6H6 + 15O2 → 12CO2 + 6H2O
7. Ammonia oxidation (Ostwald Process): NH3 + O2 → NO + H2O
Ans: 4NH3 + 5O2 → 4NO + 6H2O
8. Acid Base Neutralization: H3PO4 + Ca(OH)2 → Ca3(PO4)2 + H2O
Ans: 2H3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6H2O
9. Complex Double Displacement: Al(NO3)3 + H2SO4 → Al2(SO4)3 + HNO3
Ans: 2Al(NO3)3 + 3H2SO4 → Al2(SO4)3 + 6HNO3
10. Copper displacement by Silver Nitrate: Cu + AgNO3 → Cu(NO3)2 + Ag
Ans: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
Balancing chemical reactions

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