Question detail
In the reaction of zinc with copper(II) sulfate, zinc is oxidised and copper(II) ions are reduced. Explain what happens to the oxidation states of zinc and copper.
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At a glance
Question
Type
exam_style
Style
Topic
Oxidation, reduction and redox equations
Question
In the reaction of zinc with copper(II) sulfate, zinc is oxidised and copper(II) ions are reduced. Explain what happens to the oxidation states of zinc and copper.
Answer
In this reaction, zinc's oxidation state increases from 0 to +2, indicating oxidation, while copper's oxidation state decreases from +2 to 0, indicating reduction.
Explanation
This answer is strong as it clearly describes the changes in oxidation states for both zinc and copper, demonstrating an understanding of oxidation and reduction processes. It tests the student's ability to apply their knowledge of oxidation states in a specific chemical context.
Common mistake
Misunderstanding Reduction
Students often confuse reduction with an increase in oxidation state instead of a decrease.
Reduction is defined as a decrease in oxidation state. To clarify, remember that when an element gains electrons, its oxidation state decreases. For example, in the reaction where Fe^3+ gains an electron to become Fe^2+, the oxidation state decreases from +3 to +2, confirming that reduction has occurred.
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