O LevelChemistryCambridge (CIE)Exam Questions9. Metals9.6 Extraction of Metals

Extraction of Metals (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

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9.6 Extraction of Metals

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1
1 mark

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

Which of these metals cannot be extracted using carbon?

  • Zinc

  • Copper

  • Aluminium

  • Iron

Choose your answer

2
1 mark

The blast furnace is used to extract iron from hematite.

A blast furnace shown in cross-section. Raw materials are fed in through a hopper at the top and waste gases leave through an outlet at the top left. The wall is labelled firebrick lining. Near the base, an arrow labelled air points into the furnace from the left, and two outlets on the right are labelled slag above and molten iron below.

The hematite contains silica as an impurity

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

  • Carbon

  • Calcium oxide

  • Carbon dioxide

  • Oxygen

Choose your answer

3
1 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

Choose your answer

4
1 mark

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

  • Iron

  • Zinc

  • Copper

  • Lithium

Choose your answer

5
1 mark

Aluminium is extracted from an ore.

Which substance is the ore of aluminium?

  • bauxite

  • cryolite

  • hematite

  • malachite

Choose your answer

1
1 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.

Choose your answer

2
1 mark

The diagram shows how aluminium is manufactured by electrolysis.

An electrolysis cell shown in cross-section. A block with three downward prongs hangs into the liquid from above and is labelled anode, positive. The container's own lining is labelled cathode, negative. The liquid filling the cell is labelled aluminium oxide dissolved in cryolite, and a paler layer at the bottom is labelled molten aluminium, with a spout leading out of the base.

What are the anode and cathode made of?

anode

cathode

A

aluminium

aluminium

B

aluminium

graphite

C

graphite

aluminium

D

graphite

graphite

    Choose your answer

    3
    1 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

      Choose your answer

      4
      1 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

        Choose your answer

        5
        1 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 

        Choose your answer

        6
        1 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

        Choose your answer

        7
        1 mark

        Iron is extracted from hematite in the blast furnace.

        Limestone is added to the furnace to remove the main impurity in the ore as slag.

        Which equation represents the formation of slag?

        • CaO + SiO2 → CaSiO3

        • CaO + SO2 → CaSO3

        • CaCO3 → CaO + CO2

        • CaO + CO2 → CaCO3

        Choose your answer

        1
        1 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

        ×

        ✓

        ✓

        B

        ✓

        ×

        ✓

        C

        ✓

        ✓

        ✓

        D

        ✓

        ×

        ×

          Choose your answer

          2
          1 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. Tin can be extracted from cassiterite using carbon.

          • 1, 2 & 3

          • 1 & 2 only

          • 1 & 3 only

          • 2 & 3 only

          Choose your answer

          3
          1 mark

          Aluminium can be manufactured using electrolysis.

          The diagram below shows the electrolysis cell.

          An electrolysis cell shown in cross-section. Two rectangular blocks, each marked with a plus sign, hang into the liquid from above and are labelled anode. The sloping inner lining of the container is labelled cathode. The liquid is labelled aluminium oxide in molten cryolite and a darker layer lying on the floor of the cell is labelled molten aluminium.

          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.

          Choose your answer

          4
          1 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

          Choose your answer

          5
          1 mark

          The diagram shows a blast furnace for the extraction of iron from hematite

          A blast furnace is shown in cross-section. Iron ore, coke and limestone are added at the top. Waste gases leave from outlets near the top on both sides. A dark horizontal layer in the upper middle is labelled X. A lighter grey layer below is labelled Y. Hot air enters through an inlet near the bottom on the right, labelled Z. Molten iron flows out from the bottom on the right. Slag flows out from the bottom on the left.

          Which row shows the correct balanced equations for the main reactions occurring in zones X, Y and Z?

          zone X

          zone Y

          zone Z

          A

          C + O2​ → CO2​

          C + CO2​→ 2CO

          Fe2​O3​ + 3CO → 2Fe + 3CO2​

          B

          C + O2​ → CO2

          CaCO3​→ CaO+CO2​

          Fe2​O3​ + 3CO → 2Fe + 3CO2​

          C

          Fe2​O3​ + 3CO → 2Fe + 3CO2​

          C + O2​ → CO2

          C + CO2​→ 2CO

          D

          Fe2​O3​ + 3CO → 2Fe + 3CO2​

          C + CO2​→ 2CO

          C + O2​ → CO2

            Choose your answer