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Extraction of Iron

Quiz by Deepali

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6 questions
Show answers
  • Q1
    Which is oxidised in the blast furnace extraction of iron?
    Limestone
    Coke
    Haematite
    Air
    20s
  • Q2
    Which reaction removes solid acidic impurities from the iron produced in a blast furnace?
    Iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
    Carbon dioxide + carbon ==> carbon monoxide
    Calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
    Carbon + oxygen ==> carbon dioxide
    20s
  • Q3
    Iron is reduced in a blast furnace. This means?
    the waste materials are driven off to concentrate the iron ore
    the oxygen is removed from the iron ore
    the impurities are removed from the iron
    the iron ore is converted into pure iron oxide
    20s
  • Q4
    Why is hot air blown into a blast furnace?
    to react with coke and release energy
    to react with impurities in the iron
    to melt the iron ore
    to keep the iron molten
    20s
  • Q5
    In which of these blast furnace reactions does one gas molecule get oxidised to another gas molecule?
    Carbon dioxide + carbon ==> carbon monoxide
    Carbon + oxygen ==> carbon dioxide
    Calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
    Iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
    20s
  • Q6
    Stages in the extraction of iron in a blast furnace are described below after iron ore, coke and limestone have been added at the top, but not in the correct order. (1) carbon dioxide reacts with coke (carbon) to form carbon monoxide (2) limestone combines with acid impurities (3) hot air is blown into the furnace (4) carbon monoxide reacts with iron oxide to make iron (5) coke (carbon) burns to form carbon dioxide Which is the correct order of sequence for (1) to (5)?
    (3) (5) (4) (1) (2)
    (5) (1) (3) (2) (4)
    (3) (5) (1) (4) (2)
    (5) (3) (1) (2) (4)
    30s

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