Question detail
For Extraction of metals and reduction, which redox focus answer best supports this Unit 4.4 objective: Explain why electrolysis is needed to extract some reactive metals from molten compounds?
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. They form stable oxides that require electrolysis - correct redox focus for electrolysis
- B. Wrong redox focus: confuses electrolysis with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Extraction of metals and reduction
- D. Wrong reaction link: does not support Explain why electrolysis is needed to extract some reactive metals from molten compounds
Answer
The correct option is They form stable oxides that require electrolysis - correct redox focus for electrolysis.
Explanation
The correct option is "They form stable oxides that require electrolysis - correct redox focus for electrolysis" because it supports the approved learning objective: Explain why electrolysis is needed to extract some reactive metals from molten compounds. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Extraction of metals and reduction.
Common mistake
Misunderstanding Electrolysis Necessity
Students often think that electrolysis is used for all metal extractions, not just for reactive metals.
Clarify that electrolysis is specifically needed for extracting reactive metals from molten compounds, while less reactive metals can be extracted using simpler methods.
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