Question detail
Chemical changes case 032 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on how obtain pure dry sample named soluble salt in Soluble salts, 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
Reactions of acids
Question
- A. Chemical changes case 032 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for how obtain pure dry sample named soluble salt
- B. Chemical changes case 032 redox-boundary: Uses reduction and displacement as if they mean the same thing (Soluble salts)
- C. Chemical changes case 032 redox-boundary: Calls the reaction redox without naming what changes (how obtain pure dry sample named soluble salt)
- D. Chemical changes case 032 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactions of acids)
Answer
The correct option is Chemical changes case 032 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for how obtain pure dry sample named soluble salt.
Explanation
The correct option is Chemical changes case 032 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for how obtain pure dry sample named soluble salt. It is correct because it directly supports the approved learning objective to explain how to obtain a pure dry sample of a named soluble salt in the required practical in Soluble salts. 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
Common Mistake in Salt Preparation
Students often forget to add the insoluble solid in excess when preparing a soluble salt, leading to incomplete reaction and impurities in the final product.
Always add the insoluble solid in excess to ensure that all the acid reacts and to filter out any unreacted solid, resulting in a pure dry sample of the soluble salt.
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