Question

In Fe-extraction, the roasting is carried out because
This question has multiple correct options
A. All $FeO$ are converted into $F{e_2}{O_3}$
B. The formation of $FeSi{O_3}$ slang is prevented
C. $F{e_2}{O_3}$ does not react with $Si{O_2}$ to form slag
D. The formation of slag $\left( {CaSi{O_2}} \right)$ is enhanced

Answer 1

Hint: We know that a method of metallurgy is roasting. In roasting, an ore is converted into its oxide when we heat it above the melting point in the presence of excess air/oxygen.

Complete step by step answer:
We must remember that in the process of roasting, the concentrated ore is heated in a blast of air and ore gets converted into oxide and impurities like sulphur, arsenic are oxidized to their respective oxides and removed, is known as roasting. It needs a very high temperature and specialized furnace such as Bessemer or reverberatory furnace.
In the process of roasting, the sulfide ore is converted into metal. We can extract moisture and non-metallic impurities that are present in the volatile gases during the process of roasting. Oxidation, sulfation, reduction, pyrohydrolysis, and chlorination are part of the solid-gas thermal reaction that is an important portion of roasting. Minerals of sulfide are obtained during the time of roasting. It does not engross any dehydration of an ore. During the time of roasting, a large amount of toxic, acidic and metallic compounds are liberated.
In Fe-extraction, the roasting is important to obtain $F{e_2}{O_3}$ from $FeO$ and to prevent the formation of slag. The slag is formed by $FeO$ and not by $F{e_2}{O_3}$.

So, the correct answer is Option A,B,C.

Note: The disadvantage of the roasting process that involves sulfides. Sulfides are the primary source of air pollution. The process of roasting also releases a huge amount of metallic, toxic, and acidic substances that may lead to harmful issues in the environment. Zinc oxide could be obtained from zinc sulfide by the process of roasting. We can write the chemical equation as,
$ZnS + 3{O_3} \rightleftarrows 2ZnO + C{O_2}$.