Question detail

Which of the following methods can prevent rusting of iron?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Using materials

Question

A. Exposing it to air
B. Coating it with paint
C. Submerging it in water
D. Leaving it unprotected

Answer

The correct option is Coating it with paint. This answer is correct because it matches the approved learning objective to describe experiments that show both air and water are necessary for rusting. (Chemistry only; WS 2.2, 7, 3.5) in the subtopic Corrosion and its prevention.

Explanation

The correct option is Coating it with paint. Coating it with paint is correct because it directly supports the approved learning objective to describe experiments that show both air and water are necessary for rusting. (Chemistry only; WS 2.2, 7, 3.5). This belongs to the subtopic Corrosion and its prevention within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Corrosion and its prevention.

Common mistake

Common Misunderstanding of Rusting Experiments

Students often think that rusting can occur without both air and water present in the experiments.

Emphasize that both air and water are essential for rusting to occur, and ensure to reference experiments that demonstrate this requirement.

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