Question detail
Chemical changes case 121 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on which substance oxidised and which reduced oxygen-transfer reactions in The reactivity series, not on a neighbouring Unit 4.4 reaction idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactivity of metals
Question
- A. Chemical changes case 121 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for which substance oxidised and which reduced oxygen-transfer reactions
- B. Chemical changes case 121 redox-boundary: Uses reduction and displacement as if they mean the same thing (The reactivity series)
- C. Chemical changes case 121 redox-boundary: Calls the reaction redox without naming what changes (which substance oxidised and which reduced oxygen-transfer reactions)
- D. Chemical changes case 121 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactivity of metals)
Answer
The correct option is Chemical changes case 121 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for which substance oxidised and which reduced oxygen-transfer reactions.
Explanation
The correct option is Chemical changes case 121 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for which substance oxidised and which reduced oxygen-transfer reactions. It is correct because it directly supports the approved learning objective to identify which substance is oxidised and which is reduced in oxygen-transfer reactions in The reactivity series. The other options are incorrect because they blur a Unit 4.4 concept boundary: acid versus alkali versus base, oxidation versus reduction, displacement versus reduction, electrolysis versus electroplating, anode versus cathode, positive versus negative ions, oxidation state versus ionic charge, or strong acid versus concentrated acid.
Common mistake
Oxidation and Reduction Confusion
Students often confuse oxidation with reduction, thinking that oxidation involves gaining oxygen instead of losing electrons.
Remember that oxidation is defined as the loss of electrons, while reduction is the gain of electrons. Focus on the electron transfer process to clarify these concepts.
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