Question detail
For Electrolysis of aqueous solutions, which reaction focus answer best supports this Unit 4.4 objective: Predict that hydrogen is produced at the cathode if the metal is more reactive than hydrogen?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Electrolysis
Question
- A. Only halogen gas is produced - correct reaction focus for hydrogen
- B. Wrong reaction focus: confuses hydrogen with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Electrolysis of aqueous solutions
- D. Wrong reaction link: does not support Predict that hydrogen is produced at the cathode if the metal is more reactive than hydrogen
Answer
The correct option is Only halogen gas is produced - correct reaction focus for hydrogen.
Explanation
The correct option is "Only halogen gas is produced - correct reaction focus for hydrogen" because it supports the approved learning objective: Predict that hydrogen is produced at the cathode if the metal is more reactive than hydrogen. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Electrolysis of aqueous solutions.
Common mistake
Hydrogen Production Prediction Error
Students often incorrectly predict that hydrogen is produced at the cathode regardless of the metal's reactivity.
Remind students to compare the reactivity of the metal with hydrogen; hydrogen is produced only if the metal is more reactive than hydrogen.
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