When separate strips of aluminium foil and copper foil are heated in air, the copper foil reacts to form a black solid, whereas the aluminium foil does not react. Which statement accounts for these observations?
- AAluminium has an unreactive layer, but copper does not.
- BAluminium is below copper in the reactivity series.
- CCopper reacts with moisture in the air, but aluminium does not.
- DCopper reacts with nitrogen in the air, but aluminium does not.