Chemistry 5070 · O Level · Extraction of metals

Extraction of metals — practice question

The iron(III) oxide placed in a blast furnace includes the impurity silicon(IV) oxide, $\text{SiO}_2$. Which reaction is used to remove the silicon(IV) oxide?

  • A$3\text{SiO}_2 + \text{Fe}_2\text{O}_3 \rightarrow 2\text{Fe} + 3\text{SiO}_3$
  • B$\text{SiO}_2 + \text{C} \rightarrow \text{Si} + \text{CO}_2$
  • C$\text{SiO}_2 + \text{CaO} \rightarrow \text{CaSiO}_3$
  • D$2\text{SiO}_2 + \text{N}_2 \rightarrow 2\text{Si} + 2\text{NO}_2$

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