Question detail

Chemical changes case 024 reactivity-evidence. A student uses the reactivity series to justify an observation. Which option is best? Focus on that chlorine bromine iodine produced the anode when 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 024 reactivity-evidence: Uses the relative reactivity order to predict the change for that chlorine bromine iodine produced the anode when
B. Chemical changes case 024 reactivity-evidence: Chooses the product by memorising a colour instead of the series (Electrolysis of aqueous solutions)
C. Chemical changes case 024 reactivity-evidence: Says any metal can displace any other metal ion (that chlorine bromine iodine produced the anode when)
D. Chemical changes case 024 reactivity-evidence: Ignores whether the reacting substance is more or less reactive (Electrolysis)

Answer

The correct option is Chemical changes case 024 reactivity-evidence: Uses the relative reactivity order to predict the change for that chlorine bromine iodine produced the anode when.

Explanation

The correct option is Chemical changes case 024 reactivity-evidence: Uses the relative reactivity order to predict the change for that chlorine bromine iodine produced the anode when. It is correct because it directly supports the approved learning objective to predict that chlorine, bromine or iodine is produced at the anode when the corresponding halide ion is 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

Confusing Halide Products

Students often predict that oxygen is produced at the anode instead of chlorine, bromine, or iodine when halide ions are present.

Remember that when halide ions are present, the corresponding halogen (chlorine, bromine, or iodine) is produced at the anode instead of oxygen.

Related flashcards

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For Electrolysis of aqueous solutions, which ion focus answer best supports this Unit 4.4 objective: Predict that chlorine, bromine or iodine is produced at the anode when the corresponding halide ion is present?