Question detail

Chemical changes case 078 reactivity-evidence. A student uses the reactivity series to justify an observation. Which option is best? Focus on electrode products movement and discharge ions in Electrolysis of molten ionic compounds, 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 078 reactivity-evidence: Uses the relative reactivity order to predict the change for electrode products movement and discharge ions
B. Chemical changes case 078 reactivity-evidence: Chooses the product by memorising a colour instead of the series (Electrolysis of molten ionic compounds)
C. Chemical changes case 078 reactivity-evidence: Says any metal can displace any other metal ion (electrode products movement and discharge ions)
D. Chemical changes case 078 reactivity-evidence: Ignores whether the reacting substance is more or less reactive (Electrolysis)

Answer

The correct option is Chemical changes case 078 reactivity-evidence: Uses the relative reactivity order to predict the change for electrode products movement and discharge ions.

Explanation

The correct option is Chemical changes case 078 reactivity-evidence: Uses the relative reactivity order to predict the change for electrode products movement and discharge ions. It is correct because it directly supports the approved learning objective to explain electrode products using movement and discharge of ions in Electrolysis of molten ionic compounds. 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 Ion Movement

Students often confuse the movement of ions during electrolysis, thinking that positive ions move to the anode instead of the cathode.

Remember that positive ions are attracted to the negative electrode (cathode) where they gain electrons, while negative ions move to the positive electrode (anode) to lose electrons.

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