@Iron is formed in a blast furnace when the iron ore:
Is reduced by carbon monoxide gas
Is oxidised by carbon dioxide gas
Reacts with the added limestone

@What is the name of the reducing agent used to obtain iron from its ore in a blast furnace?
Carbon monoxide
Calcium carbonate
Hydrogen

@Aluminium is made by using a mixture of bauxite and cryolite. The aluminium is obtained by:
Electrolysing the molten mixture
Fractional distillation of the mixture
Decomposing the bauxite, the cryolite being a catalyst

@Which one of the following reactions does NOT take place in a blast furnace?
2Mg + CO  2MgO + C
C + CO  2CO
FeO + 3CO  2Fe + 3CO

@A substance not used in the production of iron is:
Sulphur
Hot air
Coke

@In a blast furnace, which one of the following is reduced?
Iron(III) oxide
Carbon monoxide
Limestone

@The different types of steel can conatain mainly iron with different elements added. Which one of the following is NOT found in steel?
Potassium
Carbon
Chromium

@Approximately how much iron is present in stainless steel?
74%
10%
Less than 1%

@The ore aluminium is manufactured from is:
Bauxite
Haematite
Chalcopyrite

@The reaction below is for the extraction of aluminium. Which one is correct?
2AlO(l)  4Al(l) + 3O(g)
2AlO(s)  2Al(s) + 3O(g)
AlO(s)  2Al(l) + 3O(g)
