Rusting of iron can be prevented by fixing a piece of a metal that is more reactive, for example magnesium, onto the iron. Which equation shows the reaction that occurs?
- A$\text{Fe(s)} \rightarrow \text{Fe}^{2+}\text{(aq)} + 2e^{-}$
- B$\text{Fe}^{2+}\text{(aq)} + 2e^{-} \rightarrow \text{Fe(s)}$
- C$\text{Mg(s)} \rightarrow \text{Mg}^{2+}\text{(aq)} + 2e^{-}$
- D$\text{Mg}^{2+}\text{(aq)} + 2e^{-} \rightarrow \text{Mg(s)}$