Question detail
Write the half equation for the oxidation of oxide ions (O^2-) at the anode during electrolysis.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Electrolysis
Question
Write the half equation for the oxidation of oxide ions (O^2-) at the anode during electrolysis.
Answer
2O^2- → O2 + 4e^-
Explanation
This answer is strong as it accurately depicts the oxidation process where oxide ions lose electrons to form oxygen gas. The question assesses the ability to write half equations related to electrolysis.
Common mistake
Common Mistake in Half Equations
Students often confuse the half equations for aluminium ion reduction and oxide ion oxidation, mistakenly writing the wrong ions or charges.
To fix this, students should carefully review the charges of the ions involved: aluminium ions (Al^3+) gain three electrons to become aluminium (Al), while oxide ions (O^2-) lose two electrons to become oxygen (O2).
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