Making predictions using the reactivity series
2 marks · NormalCobalt (Co) lies between iron and copper in the reactivity series.
Predict what would happen if a strip of cobalt was placed in a solution of iron(II) sulfate. Explain your answer.
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Show answer
No reaction; cobalt is below iron in the reactivity series so cannot displace iron from iron(II) sulfate.
Also accept: No reaction because iron is above cobalt.
Common mistakes: Thinking cobalt will displace iron; Not referencing position
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Marking points
B1 · 1 mark · States no reaction will take place.
B2 · 1 mark · Explains because cobalt is below iron in the reactivity series.
Worked solution
No reaction occurs because cobalt is less reactive than iron and cannot displace it from its salt solution.