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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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What is the main purpose of flux (e.g., limestone) in a smelting furnace?
Copper can be extracted from ores by reduction with carbon where appropriate. Which method is commonly used to extract copper from low-grade ores?
Limestone (calcium carbonate) is added to the blast furnace. What is its main purpose?
Which of the following best explains why aluminium is more expensive to produce than iron?
In the extraction of copper from copper(II) oxide using carbon, which species is oxidised?
Why are many metals extracted from their ores in a molten state during electrolysis rather than from aqueous solution?
Which statement about the thermite reaction (iron(III) oxide + aluminium) is correct in the context of metal extraction?
Which process describes removal of oxygen from a metal oxide by passing carbon monoxide over it (common in industrial extraction)?
In the Hall–Héroult process for aluminium, what is the role of cryolite (Na3AlF6)?
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?