Question

In Fe-extraction, the roasting is carried out because:

• A. all $FeO$ are to be converted to $F{e}_2{O}_3$
• B. the formation of $FeSi{O}_3$ slag is prevented
• C. $F{e}_2{O}_3$, does not react with $Si{O}_2$ to furm slag
• D. the formation of slag $\left(CaSi{O}_3\right)$ is enhanced

Answer 1

Answer: (A), (B), (C)

The correct options are
A all $FeO$ are to be converted to $F{e}_2{O}_3$
B the formation of $FeSi{O}_3$ slag is prevented
C $F{e}_2{O}_3$, does not react with $Si{O}_2$ to furm slag

Roasting - The process in which the concentrated ore is heated in blast of air and ore gets converted into oxide and impurities like sulphur, arsenic are also oxidised to their oxides and removed, is called roasting. It requires very high temperature and specialized furnace like Bessemer or reverberatory furnace.

In case of Fe, roasting is required to convert $FeO$ into $F{e}_2{O}_3$ and formation of slag is prevented by this as only $FeO$ forms slag not $F{e}_2{O}_3$.