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Extraction Of Metals And Reduction (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Extraction Of Metals And Reduction' from the broader topic Chemical Changes. The test is geared towards the AQA exam board style syllabus.
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Which metal is commonly extracted from its oxide by heating with carbon rather than by electrolysis due to cost and reactivity?
Which method would be most suitable to purify a metal that is more reactive than carbon (for example, sodium) to a high purity?
In displacement reactions used in extraction, what determines whether metal A will displace metal B from solution?
In the electrolysis of molten metal halides to extract a metal, why must the product metal be kept separate from the halogen gas produced at the anode?
Why can sodium metal not be produced by reducing sodium oxide with carbon?
Which of the following best explains why aluminium is more expensive to produce than iron?
What is a primary reason for recycling metals rather than extracting new metal from ores?
Which half-equation shows reduction at the cathode during electrolysis of molten aluminium oxide?
Which of these metals would most likely be found native (occurring uncombined) and so be extractable without reduction?
During reduction of a metal oxide MXOy using carbon, which new compound does the carbon typically form?
Which environmental concern is most directly associated with using coke (carbon) as the reducing agent in large-scale metal extraction?