The five substances below are shown in order of decreasing reactivity: potassium → aluminium → zinc → hydrogen → copper Which of the following statements about these elements is correct?
- AAluminium is formed when aluminium oxide is heated with hydrogen.
- BCopper displaces zinc from aqueous zinc sulfate.
- CCopper is formed when copper(II) oxide is heated with hydrogen.
- DWhen added to water, aluminium forms positive ions more readily than potassium forms positive ions.