Question detail
What is the half equation for the reduction of copper ions (Cu²⁺) to copper (Cu)?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Oxidation, reduction and redox equations
Question
- A. Cu²⁺ + 2e⁻ → Cu
- B. Cu → Cu²⁺ + 2e⁻
- C. Cu²⁺ → Cu + 2e⁻
- D. Cu + 2e⁻ → Cu²⁺
Answer
Cu²⁺ + 2e⁻ → Cu
Explanation
The reduction of copper ions involves the gain of electrons, represented by the half equation Cu²⁺ + 2e⁻ → Cu. This indicates a decrease in oxidation state from +2 to 0.
Common mistake
Oxidation State Confusion
Students often confuse oxidation with reduction, incorrectly stating that oxidation is a decrease in oxidation state.
Remember that oxidation is defined as an increase in oxidation state. For example, in the reaction of zinc with copper sulfate, zinc goes from an oxidation state of 0 to +2, indicating oxidation.
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