Free Extraction of metals questions for IGCSE Chemistry (0620), part of Metals. Each question has the answer and the marking points an examiner would look for.
Generate a full Extraction of Metals worksheet →All Metals questionsIron is extracted from hematite in a blast furnace.
1 Limestone decomposes and the calcium oxide removes silicon(IV) oxide as slag.
2 Iron is more reactive than carbon.
3 Carbon monoxide reduces iron(III) oxide to iron.
Which statements are correct?
Answer: B
Which term is described by this statement?
“The furnace in which iron is extracted from hematite by reduction with carbon monoxide.”
Answer: D
Why is aluminium oxide dissolved in molten cryolite during the extraction of aluminium?
Answer: D
Iron is extracted from haematite in a blast furnace.
Name the three raw materials, other than haematite, added to the blast furnace.
Write the equation for the reduction of iron(III) oxide by carbon monoxide.
Explain the purpose of the limestone.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | coke, limestone, air coke (carbon) B1 limestone B1 (hot) air B1 | 3 |
| (b) | Fe₂O₃ + 3CO → 2Fe + 3CO₂ correct formulae B1 balanced B1 | 2 |
| (c) | removes silica as slag limestone decomposes to calcium oxide B1 which reacts with silica (impurities) to form slag B1 | 2 |
Metals are extracted from ores.
Explain why gold is found uncombined in the Earth’s crust.
Explain why recycling metals is important.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | unreactive gold is very unreactive B1 | 1 |
| (b) | conserves ores; saves energy Any 2 of: conserves limited ores; saves energy; reduces mining damage/landfill B2 | 2 |
Zinc is extracted from zinc blende (ZnS).
Describe the two stages in the extraction of zinc.
Suggest why sulfur dioxide is not released into the air.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | roast to ZnO; reduce with carbon roast zinc sulfide in air to form zinc oxide (and sulfur dioxide) B1 heat zinc oxide with carbon B1 zinc is reduced B1 | 3 |
| (b) | acid rain / used to make sulfuric acid it causes acid rain (it is used to make sulfuric acid) B1 | 1 |
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