JAMB Chemistry 1979 Question 34

In the manufacture of iron in the blast furnace, iron (III) oxide is mixed with coke and limestone, and different reactions occur in the process. Which of the following statements is true with respect to these reactions?

1. A.The coke is a powerful reducing agent and easily converts the iron oxide to iron.
2. B.The calcium carbonate reacts with SiO₂, an earthly impurity in the ore, to form calcium silicate
3. C.The coke will react with the iron produced to form steel
4. D.All the carbondioxide required in the process comes from the decomposition of the calcium carbonate
5. E.The calcium carbonate decomposes to give calcium oxide, which then forms calcium silicate with the earthly impurity.