Question detail

Chemical changes case 072 reactivity-evidence. A student uses the reactivity series to justify an observation. Which option is best? Focus on movement negative ions the anode during electrolysis in The process of electrolysis, 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 072 reactivity-evidence: Uses the relative reactivity order to predict the change for movement negative ions the anode during electrolysis
B. Chemical changes case 072 reactivity-evidence: Chooses the product by memorising a colour instead of the series (The process of electrolysis)
C. Chemical changes case 072 reactivity-evidence: Says any metal can displace any other metal ion (movement negative ions the anode during electrolysis)
D. Chemical changes case 072 reactivity-evidence: Ignores whether the reacting substance is more or less reactive (Electrolysis)

Answer

The correct option is Chemical changes case 072 reactivity-evidence: Uses the relative reactivity order to predict the change for movement negative ions the anode during electrolysis.

Explanation

The correct option is Chemical changes case 072 reactivity-evidence: Uses the relative reactivity order to predict the change for movement negative ions the anode during electrolysis. It is correct because it directly supports the approved learning objective to describe movement of negative ions to the anode during electrolysis in The process of electrolysis. 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

Negative ions move to the anode

Students often think that negative ions travel to the anode during electrolysis

Explain that negative ions (anions) are attracted to the positive electrode, the anode, and are oxidised there, releasing electrons into the external circuit

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For The process of electrolysis, which electrolysis focus answer best supports this Unit 4.4 objective: Describe movement of negative ions to the anode during electrolysis?