Question detail

Chemical changes case 030 reactivity-evidence. A student uses the reactivity series to justify an observation. Which option is best? Focus on the positive electrode the anode 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 030 reactivity-evidence: Uses the relative reactivity order to predict the change for the positive electrode the anode
B. Chemical changes case 030 reactivity-evidence: Chooses the product by memorising a colour instead of the series (The process of electrolysis)
C. Chemical changes case 030 reactivity-evidence: Says any metal can displace any other metal ion (the positive electrode the anode)
D. Chemical changes case 030 reactivity-evidence: Ignores whether the reacting substance is more or less reactive (Electrolysis)

Answer

The correct option is Chemical changes case 030 reactivity-evidence: Uses the relative reactivity order to predict the change for the positive electrode the anode.

Explanation

The correct option is Chemical changes case 030 reactivity-evidence: Uses the relative reactivity order to predict the change for the positive electrode the anode. It is correct because it directly supports the approved learning objective to identify the positive electrode as the anode 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

Confusing Electrodes

Students often confuse the positive electrode with the negative electrode, incorrectly identifying the anode as the cathode.

Remember that the anode is always the positive electrode where oxidation occurs, while the cathode is the negative electrode where reduction takes place.

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