Question

Iron is extracted from hematite in the blast furnace. The hematite contains silicon(IV) oxide(sand) as an impurity. What reacts with this impurity to remove it?
A.Calcium oxide
B.Carbon
C.Carbon dioxide
D.Slag

Answer 1

Hint: Metal is extracted from the earth with impurity or we can say that in the form of ores. Afterward, we used many different methods to purify the metal then get the original metal that we want.

Complete step by step answer:
Here, we will discuss the basic points about metal and impurity.
 Ores - It is a type of natural rock that contains many metals and minerals. Metals ore in the form of sulfide, oxide, silicate, etc.
To purify the metal smelting process is used.
Smelting - In this process, heat is applying to the ore to get pure metal. It is used for iron, silver, copper, etc.
 Blast furnace - It is an industrial furnace that is used to purify the metal from its ore. It is generally used for iron but also used for copper. In this furnace air applying forcefully above the atmospheric pressure. In this hot blown air in the lower section. In this process, the final product will be slang and molten metal.
According to the question we have to extract iron from hematite in a blast furnace.
given $FeSi{O_4}$ - hematite contains silicon(IV)oxide
When we react hematite contains silicon(IV)oxide with calcium oxide we can get the pure metal and it forms slag.
$FeSi{O_4} + CaO \to Fe + CaSi{O_5}$

 Therefore, option A is the correct answer here.

Note: Apart from hematite, Iron has other ore also like magnetite, goethite, limonite, and siderite. The blast furnace was firstly used in China. Slag - It is a glass-like product that gets during smelting. It is a combination of silicon dioxide, oxide and also contains sulfide.