O Levels Chemistry (5070)•5070/12/O/N/22
Explanation
Balanced equation for acid-base reaction Steps:
- Identify reactants: CO₂ (acidic oxide) and Mg(OH)₂ (base).
- Predict products: Neutralization yields MgCO₃ (carbonate salt) and H₂O.
- Form equation: CO₂ + Mg(OH)₂ → MgCO₃ + H₂O.
- Balance atoms: 1C, 1Mg, 4O, 2H on both sides.
Why A is correct:
- Matches the neutralization reaction where CO₂ reacts with metal hydroxide to form carbonate and water, per acid-base chemistry principles.
Why the others are wrong:
- B: Incorrect products (MgO lacks carbon; unbalanced with missing C and excess O).
- C: Identical to A, so not a distinct wrong option.
- D: Identical to A, so not a distinct wrong option.
Final answer: A
Topic: Oxides
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