O LevelChemistryCambridgeExam Questions9. Metals9.6 Extraction of Metals

Extraction of Metals (Cambridge O Level Chemistry)

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9.6 Extraction of Metals

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9.6 Extraction of Metals

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11 mark

Some metals are unreactive and exist on their own in the earth. 

What are these metals known as?

  • Transition Metals

  • Native metals

  • Alkali Metals

  • Alkaline earth metals

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21 mark

Many metals can be extracted from their ores by heating the metal oxide with carbon.

Which of these metals can’t be extracted using carbon?

  • Zinc

  • Copper

  • Aluminium

  • Iron

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31 mark

The blast furnace is used to extract iron from haematite.

q3-9-3-easy-cie-igcse-chemistry

The haematite contains silica as an impurity

What is used to react with the impurity and remove it?

  • Carbon

  • Calcium oxide

  • Carbon dioxide

  • Oxygen

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41 mark

Iron is extracted from hematite, Fe2O3, in a blast furnace. Limestone is also added to the furnace.

What is the purpose of the limestone?

  • To remove impurities from the iron ore

  • To heat up the blast furnace

  • To reduce the hematite

  • To neutralise acidic gases

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51 mark

Which of the following metals can not be extracted from its ore by reduction?

  • Iron

  • Zinc

  • Copper

  • Lithium

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11 mark

In a blast furnace, iron (III) oxide is converted into iron and carbon monoxide is converted into carbon dioxide, as shown in the equation:

Fe2O3  + 3CO → 2 Fe + 3 CO2

What happens to each of these reactants?

  • Iron (III) oxide is reduced and carbon monoxide is oxidised.

  • Iron (III) oxide is oxidised and carbon monoxide is reduced.

  • Both iron (III) oxide and carbon monoxide are oxidised.

  • Both iron (III) oxide and carbon monoxide are reduced.

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21 mark

The diagram shows how aluminium is manufactured by electrolysis.

q2-9-3-medium-cie-igcse-chemistry

What are the anode and cathode made of?

  anode cathode
A aluminium aluminium
B aluminium graphite
C graphite aluminium
D graphite graphite

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    31 mark

    Aluminium is extracted from its oxide by electrolysis.

    The oxide is dissolved in ……1…… cryolite and aluminium is deposited at the ……2……

    Which words correctly complete gaps 1 and 2?

      1 2
    A aqueous cathode
    B aqueous anode
    C molten cathode
    D molten anode

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      41 mark

      What are the products at each electrode in the extraction of aluminium?

        cathode anode
      A oxygen aluminium
      B chlorine aluminium
      C aluminium chlorine
      D aluminium oxygen

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        51 mark

        Which statement about the extraction of iron from its ore is not correct?

        • Iron can be extracted by reduction with carbon

        • Iron is less difficult to extract than zinc 

        • Iron is less difficult to extract than copper 

        • Iron is extracted from the ore, hematite 

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        61 mark

        Tin is more reactive than lead but less reactive than iron.

        Which method would be most suitable for extracting tin from its ore?

        • electrolysis

        • heating alone

        • heating with carbon

        • reacting with hydrogen

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        11 mark

        The three statements about aluminium are all correct.

        1 Aluminium has an oxide ore.
        2 Aluminium is extracted from its ore by electrolysis.
        3 Aluminium is used to make cooking utensils.

        Which of the statements would still be correct if aluminium was replaced with iron?

          1 2 3
        A cross times ✓ ✓
        B ✓ cross times ✓
        C ✓ ✓ ✓
        D ✓ cross times cross times

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          21 mark

          Tin is less reactive than iron and the metal is extracted from its ore cassiterite, SnO2.

          Which of the following statements are correct?

          1. Tin does not conduct electricity.
          2. Tin is hard and shiny
          3. Tn can be extracted from cassiterite using carbon.

          • 1, 2 & 3

          • 1 & 2 only

          • 1 & 3 only

          • 2 & 3 only

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          31 mark

          Aluminium can be manufactured using electrolysis.

          The diagram below shows the electrolysis cell.

          q3-9-3-hard-cie-igcse-chemistry

          Which of these statements is not correct about electrolysis of aluminium?

          • The cathode has to be replaced regularly as it is burnt away.

          • Aluminium gains electrons during electrolysis and is reduced.

          • The anode and cathode are made of graphite.

          • Cryolite is added to reduce the melting point of the aluminium oxide.

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          41 mark

          Which reaction does not occur in the extraction of aluminium?

          • Al3+ + 3 e– → Al

          • 2 Al2O3 + 3 C → 4 Al + 3 CO2

          • 2 O2– → O2 + 4 e–

          • C + O2 → CO2

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          51 mark

          Iron is produced in a blast furnace. 

          This process involves blowing oxygen into impure molten iron and adding calcium oxide.

          What are the reasons for blowing in oxygen and adding calcium oxide?

            blowing in oxygen adding calcium oxide
          A reacts with carbon so removes it removes basic impurities making slag
          B oxygen reacts with iron reacts with slag and so removes it 
          C oxygen reacts with iron removes acidic impurities making slag 
          D reacts with carbon so removes it removes acidic impurities making slag

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