Question

Which of the following taking place in the blast furnace is endothermic?

• A. $CaCO_{3} \longrightarrow CaO + CO_{2}$
• B. $2C + O_{2} \longrightarrow 2CO$
• C. $C + O_{2} \longrightarrow CO_{2}$
• D. $Fe_{2}O_{3} + 3CO \longrightarrow 2Fe + 3CO_{2}$

Hint:

Bond breaking/Decomposition = Endothermic.

Answer 1

The Correct Option is A

Step 1: Concept
Decomposition reactions typically require heat absorption (endothermic).
Step 2: Analysis
The thermal decomposition of limestone ($CaCO_{3}$) to quicklime ($CaO$) is a key endothermic step in the blast furnace.
Step 3: Conclusion
The breaking of bonds in $CaCO_{3}$ makes this process endothermic.
Final Answer: (A)