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Electrolysis (2)

Quiz by Aji Budiyanto

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10 questions
Show answers
  • Q1
    What two species are the anions in a solution of copper sulfate?
    Copper ions and sulfate ions.
    Copper ions and hydrogen ions.
    Hydrogen ions and sulfate ions.
    Sulfate ions and hydroxide ions.
    60s
  • Q2
    The Hofmann Voltmeter is often used in the electrolysis of water. Which one of the following best describes what happens at the cathode?
    2H2O → 2H2 + O2
    2H2O → 4H+ + O2 + 4e-
    4H+ + 4e- → 2H2
    2H2O + 2e- → H2 + 2OH-
    60s
  • Q3
    n the electrolysis of an aqueous solution, which ONE of the following statements is NOT true?
    Oxidation takes place at the positive electrode.
    Reduction takes place at the cathode.
    Electrons flow around the circuit from the cathode to the negative end of the battery.
    Electrons are lost by one of the species at the anode.
    60s
  • Q4
    The electrochemical series lists the elements in order of their standard electric potentials. Which one of the following is the correct order for decreasing reactivity of the metals?
    Question Image
    Gold, copper, zinc, potassium
    Sodium, aluminium, lead, copper
    Mercury, calcium, sodium, magnesium
    Potassium, silver, magnesium, aluminium
    60s
  • Q5
    When copper sulfate solution is electrolysed by using carbon electrodes, what will happen to cathode?
    Turns blue litmus red
    O2 produced
    SO2 released
    deposit of Cu will appear
    60s
  • Q6
    list of mixtures or compounds below, produces alkali metal during electrolysis...
    NaCl concentrated solution
    molten NaI
    MgCl2 diluted solution
    molten MgCl2
    60s
  • Q7
    the following solution will produce the metal precipitation on the cathode...
    KI
    AgNO3
    NaCl
    CaCl2
    60s
  • Q8
    In the electolysis of a solution of potassium iodide with phenolphthalein indicator, a pink colour appears at the negative electrode. Which one of the following is occurring?
    Hydrogen gas is being produced at the cathode and iodine at the anode.
    Hydrogen gas is being produced at the cathode and oxygen gas at the anode.
    Iodine is being produced at the cathode and oxygen gas at the anode.
    Oxygen gas is being produced at the cathode and iodine at the anode.
    60s
  • Q9
    In the electrolysis of aqueous potassium iodide (KI) using inert electrodes, which of the following occurs?
    Water is reduced at the cathode
    Potassium ions are reduced to potassium atoms.
    Iodide ions are reduced at the anode.
    Iodine forms at the cathode.
    60s
  • Q10
    Which one of the following would make a suitable inert electrode in the electrolysis of sodium sulfate solution?
    Platinum
    Copper
    Sodium
    Nickel
    60s

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