16612780
Description
Quiz by alessia pal, updated more than 1 year ago
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Created by alessia pal
over 5 years ago
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Question 1
Question
Which of the following is FALSE concerning the electrolysis of molten sodium chloride, NaCl?
Answer
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solid sodium chloride can also undergo electrolysis
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sodium is formed at the cathode
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molten sodium chloride can be decomposed by the passage of an d.c. electric current
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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
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oxidation occurs at the anode
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an electrolyte is an electrically conducting solution of ions
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oxidation involves electron gain
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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
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oxygen cannot form at the anode
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aluminium is formed at the cathode
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solid aluminium oxide cannot undergo electrolysis
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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
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it is a reduction at the cathode
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the solution must to be acid for this cathode half-reaction to happen
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it is an oxidation at the anode
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it involves electron gain at the anode
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