DPP-10S12

BALANCING & Combination Reaction

1. Balance the following equations :

• Pb(NO₃)₂ → PbO + NO₂ + O₂
• MnO2 + HCl →MnCl₂  +  H₂O + Cl₂
• H₂S + O₂→ H₂O + SO₂
• Al₂(SO₄)₃+ BaCl₂ → AlCl₃ + BaSO₄
• Al(OH)₃  + (NH₄)₂SO₄→ Al₂(SO₄)₃ + NH₄OH

2. A solution of a substance ‘X’ is used for whitewashing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water

3. Why Combination reactions are called Exothermic Reaction?

4. Why is respiration considered an exothermic reaction? Explain.

5. What is a balanced chemical equation? Why should chemical equations be balanced?

6. Complete the following reactions :

• CaO + H₂O →
• Mg + O₂→