Final answer:
The name/formula pair that is incorrectly matched is E. cuprous sulfide / Co₂S. The correct formula for cuprous sulfide should be Cu₂S, not Co₂S, since 'Co' is the symbol for cobalt, whereas 'Cu' stands for copper.
Step-by-step explanation:
The student asked to identify the name/formula pair that is incorrectly matched from the following compounds:
- A. sodium sulfite / Na₂SO₃
- B. ammonium fluoride / NH₄F
- C. copper(II) carbonate / CuCO₃
- D. ferric chloride / FeCl₃
- E. cuprous sulfide / Co₂S
The incorrect pair is E. cuprous sulfide / Co₂S. The correct formula for cuprous sulfide is Cu₂S, where 'cuprous' indicates copper(I). 'Co' stands for cobalt, which is not correct in this context. Instead, 'Cu' represents copper.