CAIE IGCSE Chemistry 9.6.4 Symbol Equations for the Extraction of Questions

Work through real CAIE IGCSE Chemistry questions to balance and classify the reactions used in iron extraction.

Exam points

write and balance equations for iron(III) oxide reduction by carbon monoxide
write equations for limestone decomposition, lime formation and slag removal
identify combustion, reduction, thermal decomposition and neutralisation steps in the blast furnace
describe the sequence of blast-furnace reactions using balanced equations

[Maximum number: 1]

Which equation represents the reduction of a compound found in hematite in the blast furnace?

$2 \mathrm{Al}_{2} \mathrm{O}_{3} \rightarrow 4 \mathrm{Al}+3 \mathrm{O}_{2}$

$\mathrm{CaO}+\mathrm{SiO}_{2} \rightarrow \mathrm{CaSiO}_{3}$

$2 \mathrm{FeO}+\mathrm{CO} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{C}$

$\mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \rightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}$

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