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IGCSEChemistryCambridge (CIE)Exam Questions4. ElectrochemistryApplications of Electrolysis

Applications of Electrolysis (Cambridge (CIE) IGCSE Chemistry): Exam Questions

Exam code: 0620 & 0971

2 hours31 questions

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Applications of Electrolysis

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11 mark

Which metal could not be used for electroplating by using an aqueous solution?

  • Chromium

  • Copper

  • Silver

  • Sodium

Choose your answer

21 mark

During electroplating what are the correct anode (positive electrode) and cathode (negative electrode) products when aqueous copper(II) sulfate is electrolysed using copper electrodes? 

 

Anode product

Cathode product

A

copper(II) ions

copper metal

B

copper(II) ions

hydrogen gas

C

oxygen gas

copper metal

D

oxygen gas

hydrogen gas

    Choose your answer

    31 mark

    In a fuel cell ............1........... energy is converted to ..................2................ energy.

     

    1

    2

    A

    electrical

    heat

    B

    chemical

    electrical

    C

    potential

    chemical

    D

    chemical

    heat

      Choose your answer

      41 mark

      Hydrogen-oxygen fuel cells can be used to power motor vehicles.

      What is the correct balanced symbol equation for the reaction that occurs in a hydrogen-oxygen fuel cell?

      • H2O → H2 + O2

      • H2 + O2 → 2H2O

      • 2H2 + O2 → 2H2O

      • H2 + O2 → H2O

      Choose your answer

      51 mark

      Separate: Chemistry Only

      A student sets up the following equipment to investigate electroplating.

      4-2-5e-electroplating-with-silver

      What would they see occur during the electroplating process?

      • The anode would be covered with an orange-pink coating

      • The cathode would be covered with a silver coating

      • The cathode would be covered with an orange-pink coating

      • The anode would be covered with a silver coating

      Choose your answer

      11 mark

      The diagram shows a failed attempt to copper-plate a pan.

      q1-4-2-medium-cie-igcse-chem

       

      Which can be done to plate the pan with copper?

      • Cool the copper sulfate solution in an ice bath.

      • Heat the copper sulfate solution to boiling point.

      • Increase the voltage from 3 V to 6 V.

      • Make the pan the cathode and the copper the anode.

      Choose your answer

      21 mark

      Which of the following are advantages of a hydrogen fuel cell to power a car?

      • No power is lost on transmission as there are less moving parts than in an internal combustion engine.

      • Power is lost on transmission as there are more moving parts than in an internal combustion engine.

      • They produce carbon dioxide.

      • They produce oxides of nitrogen.

      Choose your answer

      31 mark

      The diagram shows a simple cell.

      q3-4-2-medium-cie-igcse-chemistry

      Which statement about the process occurring when the cell is in operation is correct?

      • Cu2+ ions are formed in solution.

      • Electrons travel through the solution.

      • The reaction Zn  →  Zn2+ +  2e– occurs.

      • The zinc electrode increases in mass

      Choose your answer

      41 mark

      A students wants to electroplate an iron spoon with silver using an aqueous silver salt as the electrolyte. 

      Which set of conditions is used?

       

      Iron spoon

      Other electrode 

      A

      cathode

      silver

      B

      anode

      silver

      C

      cathode

      carbon

      D

      anode

      carbon

        Choose your answer

        51 mark

        What are the products made by a hydrogen-oxygen fuel cell?

        1    Water

        2    Oxygen

        3    Hydrogen 

        • 1 only

        • 1 and 2

        • 2 and 3 

        • 1, 2 and 3

        Choose your answer

        11 mark

        A student wishes to electroplate an object with copper.

        Which row is correct?

         

        object is made at the

        a suitable electrolyte is

        A

        anode

        CuO(s)

        B

        anode

        CuSO4(aq)

        C

        cathode

        CuO(s)

        D

        cathode

        CuSO4(aq)

          Choose your answer

          21 mark

          Winston Churchill, a British Prime Minister, had his false teeth electroplated with gold.

          The teeth were coated with a thin layer of carbon and were then placed in the apparatus shown.

          q2-4-2-hard-cie-igcse-chemistry

           

          terminal X is

          the carbon powder could be

          A

          negative

          diamond

          B

          negative

          graphite

          C

          positive

          diamond

          D

          positive

           graphite

            Choose your answer

            31 mark

            The diagram shows an electrolysis experiment using X and Y as electrodes. 

            4-2-q3-cie-igcse-mcq-electroplating-with-copper

            Copper is used to coat the other metal. 

            Which metal becomes coated and which solution is used?

             

            aqueous solution

            metal

            A

            CoCl3

            Y

            B

            CuCl2

            Y

            C

            CuCl2

            X

            D

            CoCl3

            X

              Choose your answer

              41 mark

              What is the correct balanced symbol equation for the overall reaction in a hydrogen-oxygen fuel cell?

              • 2H2 → 4H+ + 4e–

              • 4H+ + O2 + 4e– → 2H2O

              • 2H2 + O2 → 2H2O

              • 2H2O → 2H2 + O2

              Choose your answer

              51 mark

              The following apparatus for plating a spoon with silver is shown. 

              4-2-q5-cie-igcse-mcq-electroplating-of-a-spoon

              Which statements are correct?

              1  The metal electrode would be connected to the negative terminal of the power supply

              2  The spoon would be connected to the negative terminal of the power supply

              3  At the cathode, silver ions lose electrons to form silver atoms

              4  At the anode, silver atoms lose electrons to form silver ions 

              • 2 only 

              • 1 and 4 only 

              • 2 and 4 only 

              • 1, 2 and 3

              Choose your answer