Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?

52 Which gas is produced when dilute hydrochloric acid is added to a reactive metal? 53 Give one example, with equation, of the displacement of hydrogen by a metal from an acid. 54 What is the action of water on

(a) sodium

(b) magnesium, and

(c) aluminium? Write equations of the chemical reactions involved.

55 You are given samples of three metals-sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.