Final answer:
Option 4: Fe + CuSO₄ → Cu + FeSO₄, is the illustration of a single-replacement reaction, where iron (Fe) replaces copper (Cu) in copper sulfate (CuSO₄) to form iron sulfate (FeSO₄) and copper (Cu).
Step-by-step explanation:
The question relates to identifying which of the listed options illustrates a single-replacement reaction. In this type of reaction, an element replaces another element in a compound. We are looking for an option where a single free element replaces one element in a compound, forming a new compound and displacing the other element.
Option 1 is not a single-replacement reaction; it is a combination reaction. Option 2 represents a double-replacement reaction. Option 3 is also not a single-replacement reaction, but rather a double-replacement reaction. The correct answer is Option 4: Fe + CuSO₄ → Cu + FeSO₄, because iron (Fe) replaces copper (Cu) in copper sulfate (CuSO₄) to form iron sulfate (FeSO₄) and copper (Cu), meeting the criteria for a single-replacement reaction.
If we were to write the balanced reactions for the given single-replacement examples, they would be as follows:
- Li + MgSO₄ → Mg + Li₂SO₄
- NaBr + Cl₂ → Br₂ + NaCl
- Sn + H₂SO₄ → H₂ + SnSO₄
- Al + NiBr₂ → Ni + AlBr₃