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Metals and their uses
Why can gold be found in the Earth's crust in its native state?
Gold is very rare.
Gold is very unreactive.
Gold is more reactive than silver.
Why is aluminium extracted from aluminium ore by electrolysis?
Aluminium is more reactive than carbon.
Aluminium is less reactive than carbon.
Aluminium is an expensive metal.
Why is iron extracted from iron ore by reduction with carbon or carbon monoxide?
Iron is more reactive than carbon.
Iron is less reactive than carbon.
Iron is a cheap metal.
What happens to iron oxide in a blast furnace?
It is oxidised to form iron.
It is electrolysed to form iron.
It is reduced to form iron.
In comparison with steel, what is pure iron like?
What is the percentage of iron in the iron from a blast furnace?
Which type of steel is likely to be used for making cutlery?
Low carbon steel
High carbon steel
What process is used to purify copper?
Reduction in a blast furnace
Why is titanium expensive to extract from its ore?
It resists corrosion.
Several stages are involved.
Its ore is rare.
using plants to absorb metal compounds
using bacteria to absorb metal compounds
using chemicals to absorb metal compounds
Copper can be obtained by reacting solutions of copper compounds with scrap iron. This sort of reaction is called: