Q10 / 100 · BITSAT 2023 (Memory Based Paper 1) · Chemistry
The reaction that does NOT take place in a blast furnace between $900 \mathrm{~K}$ to $1500 \mathrm{~K}$ temperature range during extraction of iron is :
- Correct answerA$\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \rightarrow 2 \mathrm{FeO}+\mathrm{CO}_2$
- B$\mathrm{FeO}+\mathrm{CO} \rightarrow \mathrm{Fe}+\mathrm{CO}_2$
- C$\mathrm{C}+\mathrm{CO}_2 \rightarrow 2 \mathrm{CO}$
- D$\mathrm{CaO}+\mathrm{SiO}_2 \rightarrow \mathrm{CaSiO}_3$
Solution
At $900-1500 \mathrm{~K}$ (higher temperature range in the blast furnace)
Reaction which take place are:
$\mathrm{C}+\mathrm{CO}_2 \longrightarrow 2 \mathrm{CO}$
$\mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{Fe}+\mathrm{CO}_2$
$\mathrm{CaO}+\mathrm{SiO}_2 \longrightarrow \mathrm{CaSiO}_3$ (Slag formation)
$\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 \mathrm{FeO}+\mathrm{CO}_2$ at $500-800 \mathrm{~K}$
Reaction which take place are:
$\mathrm{C}+\mathrm{CO}_2 \longrightarrow 2 \mathrm{CO}$
$\mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{Fe}+\mathrm{CO}_2$
$\mathrm{CaO}+\mathrm{SiO}_2 \longrightarrow \mathrm{CaSiO}_3$ (Slag formation)
$\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 \mathrm{FeO}+\mathrm{CO}_2$ at $500-800 \mathrm{~K}$
Hence, the correct answer is option: 'A'.