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Electrolysis: aqueous solutions practical

Quiz by Oak National Academy: GCSE Combined Science Edexcel Foundation

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6 questions
Show answers
  • Q1
    What is the primary function of the cathode in electrolysis?
    It attracts positive ions and facilitates their reduction.
    It allows current to flow through it.
    It attracts negative ions and facilitates their oxidation.
    It generates electric current.
    30s
  • Q2
    What are the observations at the anode during the electrolysis of copper (II) chloride solution?
    Bubbles of chlorine gas are produced.
    Copper metal is deposited.
    Bubbles of oxygen gas are produced.
    30s
  • Q3
    What happens at the cathode during the electrolysis of copper (II) sulfate solution?
    Copper ions lose electrons and are oxidised to copper oxide.
    Copper ions gain electrons and are reduced to copper metal.
    Copper ions remain in solution and do not participate in the reaction.
    30s
  • Q4
    Explain why copper is deposited at the cathode during the electrolysis of copper (II) sulfate solution.
    Copper ions gain electrons at the cathode and are reduced to copper metal.
    Copper ions remain in solution and do not participate in the reaction.
    Copper ions lose electrons at the cathode and are oxidised to copper oxide.
    30s
  • Q5
    During the electrolysis of brine, why is chlorine gas collected at the anode?
    Hydroxide ions are discharged at the anode, releasing chlorine gas.
    Chloride ions are discharged at the anode, releasing chlorine gas.
    Sodium ions are discharged at the anode, releasing chlorine gas.
    30s
  • Q6
    What is the test for oxygen gas?
    The gas relights a glowing splint.
    The gas turns limewater milky.
    The gas forms a white precipitate with acid.
    The gas burns with a 'pop'.
    30s

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