Question detail
Chemical changes case 044 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on whether oxide acidic basic from whether contains metal in Metal oxides, 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 044 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for whether oxide acidic basic from whether contains metal
- B. Chemical changes case 044 redox-boundary: Uses reduction and displacement as if they mean the same thing (Metal oxides)
- C. Chemical changes case 044 redox-boundary: Calls the reaction redox without naming what changes (whether oxide acidic basic from whether contains metal)
- D. Chemical changes case 044 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactivity of metals)
Answer
The correct option is Chemical changes case 044 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for whether oxide acidic basic from whether contains metal.
Explanation
The correct option is Chemical changes case 044 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for whether oxide acidic basic from whether contains metal. It is correct because it directly supports the approved learning objective to predict whether an oxide is acidic or basic from whether it contains a metal or a non-metal in Metal oxides. 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
Confusing Acidic and Basic Oxides
Students often predict that all metal oxides are basic and all non-metal oxides are acidic, without considering specific examples.
To fix this, students should study specific metal and non-metal oxides and their properties, remembering that while many metal oxides are basic, there are exceptions, and similarly for non-metal oxides.
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