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Extracting metal Z economically
Figure 9 shows a reactivity series.
Suggest the most economical method for extracting metal Z from an oxide of metal Z.
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Marking points
- 1 Suggests reduction by carbon, such as heating the oxide with carbon.
Full-mark answer
Heat the oxide of metal Z with carbon to reduce it.
Why this answer loses marks
Use electrolysis because it works for any metal.
The reactivity series places metal Z below carbon, so reduction with carbon is the more economical method.