Question

What is the temperature needed for decomposition of lime stone in blast furnace for extraction of iron?

• A. 1500 K
• B. 2000 K
• C. 1200 K
• D. 500 K

Hint:

The decomposition of limestone to produce lime for iron extraction typically occurs at around 1200 K.

Answer 1

The Correct Option is C

Step 1: Understanding the process.
Limestone (CaCO\(_3\)) is decomposed to produce lime (CaO) and carbon dioxide (CO\(_2\)) in the blast furnace, which is essential for the extraction of iron. The decomposition of limestone occurs at a temperature of around 1200 K.
Step 2: Analyzing the options.
(A) 1500 K: Incorrect. The temperature for decomposition is typically lower than 1500 K.
(B) 2000 K: Incorrect. This temperature is too high for the decomposition of limestone.
(C) 1200 K: Correct. Limestone decomposes efficiently at around 1200 K.
(D) 500 K: Incorrect. The temperature is too low for the decomposition process.
Step 3: Conclusion.
The correct answer is (C) 1200 K.