Question detail

What is produced at the anode during the electrolysis of an aqueous solution that does not contain halide ions?

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. Hydrogen
B. Oxygen
C. Metal
D. Chlorine

Answer

Oxygen

Explanation

Oxygen is produced at the anode unless the solution contains halide ions, which would produce halogen gases instead.

Common mistake

Misunderstanding Anode Products

Students often predict that oxygen is produced at the anode in all cases without considering the presence of halide ions.

Students should remember that oxygen is produced at the anode unless halide ions are present, in which case chlorine, bromine, or iodine will be produced instead.

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For Electrolysis of aqueous solutions, which acid-base focus answer best supports this Unit 4.4 objective: Predict that oxygen is produced at the anode unless the solution contains halide ions?