A student is provided with aqueous solutions of four metal sulphates. Each metal rod is dipped in turn into each of the four metal sulphate solutions. The results are shown in the table.

1. aWrite the metals in order of increasing reactivity. [2]
2. bSuggest an explanation in terms of electron loss or gain for your answer. [2]
3. cWrite an ionic equation for the reaction which takes place between iron and copper(II) sulphate. [2]
4. dWhen an aluminium rod is dipped into iron(II) sulphate solution, no change is seen, yet aluminium is higher in the activity series than iron. Explain why there is no reaction. [1]

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