Question:
What is the temperature needed for decomposition of lime stone in blast furnace for extraction of iron?
What is the temperature needed for decomposition of lime stone in blast furnace for extraction of iron?
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The decomposition of limestone to produce lime for iron extraction typically occurs at around 1200 K.
Updated On: Feb 9, 2026
- 1500 K
- 2000 K
- 1200 K
- 500 K
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The Correct Option is C
Solution and Explanation
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.
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.
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