Question detail

Chemical changes case 065 acid-base-boundary. A student sorts acid, alkali and base statements. Which option keeps the terms distinct? Focus on products aqueous electrolysis the reactivity series and ions in Electrolysis of aqueous solutions, 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 065 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for products aqueous electrolysis the reactivity series and ions
B. Chemical changes case 065 acid-base-boundary: Treats every base as an alkali without checking solubility (Electrolysis of aqueous solutions)
C. Chemical changes case 065 acid-base-boundary: Uses pH wording but does not identify the acid-base role (products aqueous electrolysis the reactivity series and ions)
D. Chemical changes case 065 acid-base-boundary: Names a salt product without explaining the reaction context (Electrolysis)

Answer

The correct option is Chemical changes case 065 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for products aqueous electrolysis the reactivity series and ions.

Explanation

The correct option is Chemical changes case 065 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for products aqueous electrolysis the reactivity series and ions. It is correct because it directly supports the approved learning objective to explain products of aqueous electrolysis using the reactivity series and ions present in Electrolysis of aqueous solutions. 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 Reactivity Series

Students often confuse the reactivity series and incorrectly predict the products of aqueous electrolysis, thinking that the metal will always be produced at the cathode regardless of its reactivity compared to hydrogen.

To fix this, students should remember that if the metal is more reactive than hydrogen, hydrogen will be produced at the cathode instead. Reviewing the reactivity series and practicing predictions based on it can help reinforce this concept.

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For Electrolysis of aqueous solutions, which redox focus answer best supports this Unit 4.4 objective: Explain products of aqueous electrolysis using the reactivity series and ions present?