O-LevelChemistryMetals & Reactivity5070/11 · May/June 2025 · Q281 Mark

Iron is extracted from its ore hematite in a blast furnace. Which statement about this extraction process is correct?

AAir is blown into the blast furnace to react with carbon.

BAt the bottom of the blast furnace, a layer of molten iron floats on top of a layer of molten slag.

CLimestone is decomposed in the blast furnace to produce carbon monoxide.

DSilicon dioxide, an impurity in the ore, is a basic oxide.

✓ Correct answer

A: Air is blown into the blast furnace to react with carbon.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2025 Paper 1 Variant 1, question 28.

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