Sodium chloride solution can undergo electrolysis.
What product will be formed at the negative electrode?
Oxygen
Chlorine
Hydrogen
Sodium
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Sodium chloride solution can undergo electrolysis.
What product will be formed at the negative electrode?
Oxygen
Chlorine
Hydrogen
Sodium
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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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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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Aluminium is extracted from its ore by electrolysis.
The electrolyte is a mixture of molten aluminium oxide and cryolite.
What is the role of the cryolite?
To act as a catalyst
To lower the melting point of the aluminium oxide
To enable the aluminium oxide to conduct electricity
To lower the boiling point of aluminium oxide
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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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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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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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