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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

The electrolysis of copper(ii) sulfate solution using inert electrodes

18 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State the products formed at the cathode and at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes.

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  2. Question 2

    4 marks · Normal

    Copper(II) sulfate solution is electrolysed using inert electrodes.

    (a)

    Write the balanced half-equation for the reaction at the cathode.

    [2 marks]
    (b)

    Write the balanced half-equation for the reaction at the anode.

    [2 marks]
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  3. Question 3

    3 marks · Normal

    Copper is deposited at the cathode during the electrolysis of copper(II) sulfate solution with inert electrodes.

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  4. Question 4

    3 marks · Normal

    Describe how the appearance and composition of copper(II) sulfate solution change after it is electrolysed for a long period using inert electrodes.

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  5. Question 5

    4 marks · Normal

    The following table shows the observations at the electrodes during electrolysis of copper(II) sulfate solution with inert electrodes.

    (a)
    Observations during Electrolysis
    ElectrodeObservation
    CathodePink/brown coating forms
    AnodeGas bubbles produced
    [0 marks]
    (b)

    Name the substance forming the pink/brown coating at the cathode.

    [1 mark]
    (c)

    Name the gas produced at the anode.

    [1 mark]
    (d)

    Suggest a simple test to confirm the identity of the gas collected at the anode.

    [2 marks]
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  6. Question 6

    1 mark · Normal

    Which of the following is the correct balanced half-equation for the reaction at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes?

    1. A.Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)
    2. B.2Cl^-(aq) \rightarrow Cl_2(g) + 2e^-
    3. C.4OH^-(aq) \rightarrow 2H_2O(l) + O_2(g) + 4e^-
    4. D.H^+(aq) + e^- \rightarrow H_2(g)
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  7. Question 7

    2 marks · Normal

    Explain why oxygen gas is produced at the anode during the electrolysis of copper(II) sulfate solution with inert electrodes.

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  8. Question 8

    4 marks · Normal

    Copper(II) sulfate solution is electrolysed using inert electrodes for a long time.

    (a)

    Describe what happens to the colour of the solution.

    [2 marks]
    (b)

    Explain why these changes occur.

    [2 marks]
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