11 mark
Sodium chloride solution can undergo electrolysis.
What product will be formed at the negative electrode?
Oxygen
Chlorine
Hydrogen
Sodium
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Electrolysis (OCR Gateway GCSE Chemistry: Combined Science)
Exam Questions
1 hour17 questions
21 mark
Electrolysis can be used to separate molten lead bromide.
Which statement is true for what happens at the negative electrode?
Lead atoms are oxidised
Lead atoms are reduced
Lead ions are oxidised
Lead ions are reduced
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31 mark
When copper(II) sulfate undergoes electrolysis, it produces oxygen gas at the positive electrode.
The unbalanced half equation below represents the reaction that occurs at the positive electrode.
Which numbers will correctly balance the half equation?
___ OH- → O2 + ___ H2O + ___ e-
2,2,2
2,4,2
4,2,4
4,4,2
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41 mark
During the the electrolysis of copper sulfate solution, copper ions move to the negative electrode.
What is the reason for this?
Copper is less reactive than hydrogen and consists of negatively charged ions
Copper is more reactive than hydrogen and consists of negatively charged ions
Copper is less reactive than hydrogen and consists of positively charged ions
Copper is more reactive than hydrogen and consists of positively charged ions
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51 mark
A student was investigating the electrolysis of zinc chloride.
What is the correct reason for electrolysis not working?
Solid zinc chloride has been used
The electrodes don't conduct electricity
The power supply is not connected properly
The crucible is too small to allow ions to flow
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61 mark
Some metals, such as aluminium, are extracted from their ores using electrolysis.
Why are some metals extracted using electrolysis?
They are native metals
They are more reactive than carbon
They have low melting points
They conduct electricity
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71 mark
During the electrolysis of molten potassium chloride, what is made at the cathode?
Chlorine
Hydrogen
Potassium
Potassium hydroxide
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81 mark
An aqueous solution of concentrated sodium chloride is electrolysed. Bubbles are seen at the positive electrode.
What is the name of the substance produced at the positive electrode?
Chlorine
Hydrogen
Sodium
Oxygen
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91 mark
During the electrolysis of molten copper chloride, what is made at the positive electrode (anode)?
Chloride
Chlorine
Copper
Hydrogen
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11 mark
During the electrolysis of molten lead bromide, bromine is made at the anode.
Which half equation shows that bromine is made at the anode?
2Br- → Br2 + 2e-
Br- → Br + e-
Br2 + 2e- → 2Br-
2Br- → Br2 - 2e-
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