Question detail

Chemical changes case 012 acid-base-boundary. A student sorts acid, alkali and base statements. Which option keeps the terms distinct? Focus on oxide ions losing electrons the anode form oxygen in Using electrolysis to extract metals, not on a neighbouring Unit 4.4 reaction idea.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Electrolysis

Question

A. Chemical changes case 012 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for oxide ions losing electrons the anode form oxygen
B. Chemical changes case 012 acid-base-boundary: Treats every base as an alkali without checking solubility (Using electrolysis to extract metals)
C. Chemical changes case 012 acid-base-boundary: Uses pH wording but does not identify the acid-base role (oxide ions losing electrons the anode form oxygen)
D. Chemical changes case 012 acid-base-boundary: Names a salt product without explaining the reaction context (Electrolysis)

Answer

The correct option is Chemical changes case 012 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for oxide ions losing electrons the anode form oxygen.

Explanation

The correct option is Chemical changes case 012 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for oxide ions losing electrons the anode form oxygen. It is correct because it directly supports the approved learning objective to describe oxide ions losing electrons at the anode to form oxygen in Using electrolysis to extract metals. 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 Oxide Ion Behavior

Students often state that oxide ions gain electrons at the anode instead of losing them.

Remember that oxidation occurs at the anode, where negative ions like oxide lose electrons to form oxygen.

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For Using electrolysis to extract metals, which reaction focus answer best supports this Unit 4.4 objective: Describe oxide ions losing electrons at the anode to form oxygen?