Question detail
Chemical changes case 070 salt-method. A student plans a salt preparation method. Which option is most creditworthy? Focus on oxidation gain oxygen and reduction loss oxygen reactions in The reactivity series, 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
Reactivity of metals
Question
- A. Chemical changes case 070 salt-method: Uses the correct reactants, separation step and crystallisation idea for oxidation gain oxygen and reduction loss oxygen reactions
- B. Chemical changes case 070 salt-method: Evaporates to dryness when crystals should be formed carefully (The reactivity series)
- C. Chemical changes case 070 salt-method: Adds indicator to every salt preparation regardless of method (oxidation gain oxygen and reduction loss oxygen reactions)
- D. Chemical changes case 070 salt-method: Names a salt but omits how excess solid or solution is handled (Reactivity of metals)
Answer
The correct option is Chemical changes case 070 salt-method: Uses the correct reactants, separation step and crystallisation idea for oxidation gain oxygen and reduction loss oxygen reactions.
Explanation
The correct option is Chemical changes case 070 salt-method: Uses the correct reactants, separation step and crystallisation idea for oxidation gain oxygen and reduction loss oxygen reactions. It is correct because it directly supports the approved learning objective to explain oxidation as gain of oxygen and reduction as loss of oxygen in reactions involving metal compounds in The reactivity series. 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
Confusing Oxidation and Reduction
Students often confuse oxidation with loss of oxygen and reduction with gain of oxygen, leading to incorrect explanations of reactions.
Remember that oxidation is defined as gain of oxygen, while reduction is loss of oxygen. Use examples of metal reactions to illustrate these definitions.
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