Which of the following is an example of a combination reaction?
Correct: B
A combination reaction (also known as a synthesis reaction) is a reaction in which two or more reactants combine to form a single, more complex product.
- A) CaCO₃(s) → CaO(s) + CO₂(g) is a decomposition reaction.
- B) 2Mg(s) + O₂(g) → 2MgO(s): Magnesium combines with oxygen to form magnesium oxide. This fits the definition of a combination reaction.
- C) Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s) is a displacement reaction.
- D) BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq) is a double displacement reaction.