Electrochemistry Form 4
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  • Question 1
    120 seconds
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    Q.

    Which of the following is true about an electrolyte?


    I Electrolyte conducts electricity in molten state.

    II Electrolyte conducts electricity in solid state.

    III Electrolyte is soluble in water.

    IV Electrolyte undergoes chemical decomposition when it conducts electricity.

    answer choices

    I and II only

    II and III only

    II and IV only

    I and IV only

  • Question 2
    120 seconds
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    Q.

    Which of the following is not an electrolyte?

    answer choices

    Molten glucose

    Aqueous ammonia

    Molten lead (II) bromide

    Molten potassium iodide

  • Question 3
    120 seconds
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    Q.

    Naphthalene does not conduct electricity because it

    answer choices

    contains freely moving electrons.

    has very low melting points.

    consists of molecules which are uncharged particles.

    contains ionic compounds which can dissolve in water.

  • Question 4
    120 seconds
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    Q.

    Which of the following is most probably substance X?

    answer choices

    Molten napthalene

    Pure ethanol

    Solid lead (II) bromide

    Potassium iodide solution

  • Question 5
    120 seconds
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    Q.

    What are the ions present in molten lead (II) bromide?

    answer choices

    PbBr2

    Pb and Br

    Pb2+ and Br

    Pb2+ and Br2

  • Question 6
    120 seconds
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    Q.

    Which of the following happens during the electrolysis of molten sodium bromide?


    I Sodium ions are attracted to the cathode.

    II Bromide ions are attracted to the anode.

    III Electrons are moving from anode to cathode.

    IV At the cathode, bromine ions accept electron from anode.

    answer choices

    I, II and III only

    I, II and IV only

    I, III and IV only

    II, III and IV only

  • Question 7
    120 seconds
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    Q.

    What is formed at carbon electrode Q?

    answer choices

    Hydrogen gas

    Oxygen gas

    Iron metal

    Nitrogen gas

  • Question 8
    120 seconds
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    Q.

    The electrolysis of aqueous sodium nitrate using carbon electrode was carried out in a lab. Which of the following is true about this experiment?

    answer choices

    The sodium ions are discharged at the cathode.

    The nitrate ions are discharged at the anode.

    Hydrogen gas is produced in the anode

    Oxygen gas is produced in the anode.

  • Question 9
    120 seconds
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    Q.

    What need to be changed in order to get different gas from this experiment?

    answer choices

    Substitute carbon electrodes with copper electrodes.

    Use a more concentrated copper (II) chloride solution.

    Change the position of the battery.

    Substitute carbon electrodes with platinum.

  • Question 10
    120 seconds
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    Q.

    Which of the following are the factors that determine the type of ions to be discharged at the electrodes?


    I Type of electrode used.

    II Concentration of ions in the solution.

    III The molecular mass of the atom used.

    IV Position of ions in electrochemical series.

    answer choices

    I, II and III only

    I, II and IV only

    I, III and IV only

    II, III and IV only

  • Question 11
    120 seconds
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    Q.

    Diagram 4 shows the set-up of the apparatus used to electroplate an iron key with silver. What is the observation after 30 minutes?


    I At anode, silver foil become thinner.

    II At anode, shinny grey deposits are formed.

    III At cathode, gas bubbles are released.

    IV At cathode, shinny grey deposits are formed.

    answer choices

    I and II only

    II and III only

    II and IV only

    I and IV only

  • Question 12
    120 seconds
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    Q.

    Which of the following is true about electroplating an iron key with copper?

    answer choices

    A

    B

    C

    D

  • Question 13
    120 seconds
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    Q.

    Which of the following is true about the voltaic cell?


    I The copper plate dissolves gradually.

    II The zinc plate acts as negative terminal.

    III The zinc plate become thinner.

    IV Electrons flow from zinc plate to copper plate.

    answer choices

    I, II and III only

    I, II and IV only

    I, III and IV only

    II, III and IV only

  • Question 14
    120 seconds
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    Q.

    Which of the following changes can increase the reading on the voltmeter?

    answer choices

    Use a more concentrated sodium chloride.

    Change the zinc plate to magnesium plate.

    Change the copper plate to lead plate.

    Increase the volume of aqueous sodium chloride.

  • Question 15
    120 seconds
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    Q.

    What is the correct chemical reaction that takes place in the positive terminal of the chemical cell?

    answer choices

    Zn2+ + 2e → Zn

    Zn → Zn2+ + 2e

    Ag+ + e → Ag

    Ag → Ag+ + e

  • Question 16
    120 seconds
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    Q.

    Which of the following pairs can produce the highest reading on the voltmeter?

    answer choices

    Zinc / Magnesium

    Zinc / Copper

    Magnesium / Copper

    Magnesium / Silver

  • Question 17
    120 seconds
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    Q.

    Jenny wants to make her ring more beautiful and prevent corrosion. What is the best way to achieve this?

    answer choices

    Dip the ring in oil.

    Wash the ring with soap.

    Plate the ring with gold.

    Polished the ring with water.

  • Question 18
    120 seconds
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    Q.

    Table 1 shows the information about three simple cells.

    What is the potential difference of the metal pair Q and S?

    answer choices

    0.5 V

    0.9 V

    1.8 V

    2.6 V

  • Question 19
    120 seconds
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    Q.

    Table 2 shows the information of two simple cells.

    Which of the following is the ascending order of electrode X, Y and Z in the electrochemical series?

    answer choices

    Z, Y and X

    Y, X and Z

    X, Y and Z

    X, Z and Y

  • Question 20
    120 seconds
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    Q.

    Which of the following is not the example of electrochemical industries in our daily life?

    answer choices

    Voltaic cells are used in different devices such as radio, hand phones, and others.

    Electroplating of iron can prevent it from corrosion.

    Chemical substance such as chlorine is used to produce toxic solution.

    Extraction of useful metals such as aluminium using electrolysis.

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