Question detail
Chemical changes case 034 electrode-ions. A student predicts electrolysis products. Which option keeps ions and electrodes clear? 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 034 electrode-ions: Matches the ion movement to the correct electrode and product for how obtain pure dry sample named soluble salt
- B. Chemical changes case 034 electrode-ions: Sends positive ions to the positive electrode (Soluble salts)
- C. Chemical changes case 034 electrode-ions: Uses electroplating language instead of electrolysis language (how obtain pure dry sample named soluble salt)
- D. Chemical changes case 034 electrode-ions: Chooses a product without checking the ion discharged (Reactions of acids)
Answer
The correct option is Chemical changes case 034 electrode-ions: Matches the ion movement to the correct electrode and product for how obtain pure dry sample named soluble salt.
Explanation
The correct option is Chemical changes case 034 electrode-ions: Matches the ion movement to the correct electrode and product 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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