Question detail

Chemical changes case 066 acid-base-boundary. A student sorts acid, alkali and base statements. Which option keeps the terms distinct? Focus on reduction metal oxide carbon terms oxygen removal in Extraction of metals and reduction, 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

Reactivity of metals

Question

A. Chemical changes case 066 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for reduction metal oxide carbon terms oxygen removal
B. Chemical changes case 066 acid-base-boundary: Treats every base as an alkali without checking solubility (Extraction of metals and reduction)
C. Chemical changes case 066 acid-base-boundary: Uses pH wording but does not identify the acid-base role (reduction metal oxide carbon terms oxygen removal)
D. Chemical changes case 066 acid-base-boundary: Names a salt product without explaining the reaction context (Reactivity of metals)

Answer

The correct option is Chemical changes case 066 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for reduction metal oxide carbon terms oxygen removal.

Explanation

The correct option is Chemical changes case 066 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for reduction metal oxide carbon terms oxygen removal. It is correct because it directly supports the approved learning objective to describe reduction of a metal oxide by carbon in terms of oxygen removal in Extraction of metals and reduction. 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

Misunderstanding Reduction

Students often confuse reduction with the addition of oxygen instead of understanding it as the removal of oxygen from a metal oxide.

To fix this, remember that reduction involves the loss of oxygen from a compound, such as a metal oxide, when it reacts with carbon.

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For Extraction of metals and reduction, which ion focus answer best supports this Unit 4.4 objective: Describe reduction of a metal oxide by carbon in terms of oxygen removal?