O-LevelChemistryMetals & Reactivity5070/12 · May/June 2020 · Q281 Mark

Which equation shows a thermal decomposition that occurs in the blast furnace?

A+ O2 → CO2

BCO2 + C → 2CO

CCaCO3 → CaO + CO2

DCaO + SiO2 → CaSiO3

✓ Correct answer

C: CaCO3 → CaO + CO2

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 28.

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