Question

Which among the following changes occurs at 900 K in blast furnace for extraction of iron?

• A. Reduction of ore by C
• B. Reduction of ore by CO
• C. Ore loses moisture
• D. Limestone decomposes

Hint:

In a blast furnace, carbon monoxide (CO) is the reducing agent that reduces iron ore to iron, and carbon dioxide (CO2) is produced.

Answer 1

The Correct Option is B

Step 1: Understanding the process in a blast furnace.
In a blast furnace, iron ore (mostly Fe2O3) is reduced to iron metal. The key reaction involves the reduction of iron ore by carbon monoxide (CO) at 900 K, where carbon monoxide reduces the iron oxide to iron and carbon dioxide is released.
Step 2: Analyzing the options.
(A) Reduction of ore by C: This is not the correct answer because at 900 K, carbon monoxide (CO) is the main reducing agent, not carbon (C).
(B) Reduction of ore by CO: This is the correct option because carbon monoxide is the main reducing agent used in blast furnaces to reduce iron ore.
(C) Ore loses moisture: This is not correct, as the reaction involves reduction, not the removal of moisture from the ore.
(D) Limestone decomposes: Limestone is used in the furnace to remove impurities, but its decomposition occurs at higher temperatures, not at 900 K.
Step 3: Conclusion.
The correct answer is (B) Reduction of ore by CO, as this is the reduction process that occurs at 900 K in a blast furnace.