Chemistry · May / June 2021 · Paper 12 · Question 33

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

1. AAir is blown into the blast furnace to react with carbon.
2. BAt the bottom of a blast furnace a layer of molten iron floats on top of a layer of molten slag.
3. CLimestone is decomposed in the blast furnace to produce carbon monoxide.
4. DSilicon dioxide, an impurity in the ore, is a basic oxide.

As printed in the paper