Electrolysis

alessia pal
Quiz by alessia pal, updated more than 1 year ago
alessia pal
Created by alessia pal over 2 years ago
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Question 1

Question
Which of the following is FALSE concerning the electrolysis of molten sodium chloride, NaCl?
Answer
  • solid sodium chloride can also undergo electrolysis
  • sodium is formed at the cathode
  • molten sodium chloride can be decomposed by the passage of an d.c. electric current
  • chlorine is formed at the anode

Question 2

Question
Electrolysis is brought about by passing a d.c. electrical current through a solution of ions (electrolyte). Which of the following statements is FALSE?
Answer
  • oxidation occurs at the anode
  • an electrolyte is an electrically conducting solution of ions
  • oxidation involves electron gain
  • cations are reduced at an electrode

Question 3

Question
Which of the following statements is FALSE concerning the electrolysis of molten aluminium oxide, Al2O3 ?
Answer
  • oxygen cannot form at the anode
  • aluminium is formed at the cathode
  • solid aluminium oxide cannot undergo electrolysis
  • molten aluminium oxide can be decomposed by the passage of an d.c. electric current

Question 4

Question
Given the following half-equation for what may happen on the surface of an electrode in electrolysis. 2H+(aq) + 2e- ==> H2(g) Which statement is TRUE about this electrode equation?
Answer
  • it is a reduction at the cathode
  • the solution must to be acid for this cathode half-reaction to happen
  • it is an oxidation at the anode
  • it involves electron gain at the anode
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