Question detail
For Electrolysis of aqueous solutions, which redox focus answer best supports this Unit 4.4 objective: Identify products of aqueous electrolysis using suitable chemical tests where appropriate?
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. Chlorine is produced at the anode if halide ions are present. - correct redox focus for aqueous electrolysis
- B. Wrong redox focus: confuses aqueous 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 Electrolysis of aqueous solutions
- D. Wrong reaction link: does not support Identify products of aqueous electrolysis using suitable chemical tests where appropriate
Answer
The correct option is Chlorine is produced at the anode if halide ions are present. - correct redox focus for aqueous electrolysis.
Explanation
The correct option is "Chlorine is produced at the anode if halide ions are present. - correct redox focus for aqueous electrolysis" because it supports the approved learning objective: Identify products of aqueous electrolysis using suitable chemical tests where appropriate. 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
Misidentifying the anode product
Students often think that oxygen is always produced at the anode in aqueous electrolysis, even when halide ions are present.
Explain that if halide ions (Cl⁻, Br⁻, I⁻) are present, the anode reaction will produce the corresponding halogen (Cl₂, Br₂, I₂) because the halide oxidation potential is lower than that of water. Use the reactivity series and ion potentials to predict the correct anode product, and remind students to test the gas with appropriate chemical tests (e.g., sodium hydroxide for chlorine, silver nitrate for bromine).
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