Metals below carbon in the reactivity series
3 marks · EasyThe table shows the position of several metals in the reactivity series relative to carbon:
| Metal | Position in series |
|---|---|
| Potassium | above carbon |
| Lead | below carbon |
| Iron | below carbon |
| Aluminium | above carbon |
Name two metals from the table that can be extracted by heating their oxides with carbon.
Explain why potassium cannot be extracted by reduction with carbon.
Suggest the method used to extract aluminium from aluminium oxide.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Iron and lead
(b) It is above carbon in the reactivity series.
(c) Electrolysis
Also accept: Iron and lead, stated together or separately
Common mistakes: Potassium as below carbon
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Names two metals below carbon: iron and lead.
B1 (b) · 1 mark · Explains potassium is above carbon and cannot be reduced by carbon.
B1 (c) · 1 mark · Suggests correct method: electrolysis.
Worked solution
a) Iron and lead are both below carbon so can be extracted by heating with carbon. b) Potassium cannot be extracted this way because it is above carbon in the reactivity series. c) Aluminium is extracted from its oxide by electrolysis.