Arrange the following metals in the order of their decreasing chemical activity: magnesium, iron, gold

28 Name a metal that is not attacked by cold water, boiling water or steam. 29 Name one metal that decomposes boiling water and not cold water 31 What would you observe when a strip of zinc is dipped in the solution of copper sulphate? 32 Can copper displace iron from iron sulphate solution? Give reason