Question detail

Chemical changes case 140 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on strong acid completely ionised aqueous solution in Strong and weak acids (HT only), 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

Reactions of acids

Question

A. Chemical changes case 140 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for strong acid completely ionised aqueous solution
B. Chemical changes case 140 redox-boundary: Uses reduction and displacement as if they mean the same thing (Strong and weak acids (HT only))
C. Chemical changes case 140 redox-boundary: Calls the reaction redox without naming what changes (strong acid completely ionised aqueous solution)
D. Chemical changes case 140 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactions of acids)

Answer

The correct option is Chemical changes case 140 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for strong acid completely ionised aqueous solution.

Explanation

The correct option is Chemical changes case 140 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for strong acid completely ionised aqueous solution. It is correct because it directly supports the approved learning objective to (HT only) Describe a strong acid as completely ionised in aqueous solution in Strong and weak acids (HT only). 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 Strong Acids

Students often think that strong acids are just more concentrated than weak acids, rather than being completely ionised in solution.

Emphasize that a strong acid is defined by its complete ionisation in aqueous solution, regardless of its concentration.

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For Strong and weak acids (HT only), which reaction focus answer best supports this Unit 4.4 objective: (HT only) Describe a strong acid as completely ionised in aqueous solution?