Corrosion
Metal Q: Reaction in the air: Burns to form metallic oxide. Reaction with water: Reacts with steam to form hydrogen and reaction with dilute hydrochloric acid: hydrogen is formed.
Metal R: Reaction in the air: reacts slowly to form metallic oxide. Reaction with water: Does not react. reaction with dilute hydrochloric acid: Does not react.
Metal S: Reaction in the air: reacts to form metallic oxide. Reaction with water: Does not react. reaction with dilute hydrochloric acid: Hydrogen is formed.
List the metals in order of decreasing reactivity. Give reasons for your choice.