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Assertion: Limestone addes in the blast ...

Assertion: Limestone addes in the blast furnace decomposes to give CaO which forms slag in molten state and separates out from iron
Reason : The iron obtained from the blast furnace contains about 4% carbon and many impurities like S,P,Si, Mn, etc.

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

if both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given question, we will break it down into steps to understand both the assertion and the reason, and then determine the relationship between them. ### Step 1: Understand the Assertion The assertion states that limestone added to the blast furnace decomposes to give calcium oxide (CaO), which forms slag in a molten state and separates out from iron. - **Explanation**: Limestone (CaCO3) decomposes at high temperatures in the blast furnace into calcium oxide (CaO) and carbon dioxide (CO2). The CaO produced acts as a flux, reacting with impurities (like SiO2) to form slag, which is less dense than molten iron and floats on top, allowing for separation. ### Step 2: Understand the Reason The reason states that the iron obtained from the blast furnace contains about 4% carbon and many impurities like sulfur (S), phosphorus (P), silicon (Si), and manganese (Mn). - **Explanation**: The iron produced in a blast furnace is known as cast iron, which typically contains around 4% carbon along with various impurities. These impurities are a result of the raw materials used in the blast furnace process. ### Step 3: Evaluate the Relationship Now, we need to evaluate if the reason explains the assertion. - **Assertion**: Correct, as it accurately describes the role of limestone in the blast furnace. - **Reason**: Correct, as it accurately describes the composition of the iron produced. However, the reason does not explain the assertion. The assertion focuses on the chemical process involving limestone and slag formation, while the reason discusses the composition of the iron produced, which is a separate topic. ### Conclusion Both the assertion and the reason are correct statements, but the reason does not serve as an explanation for the assertion. ### Final Answer - **Assertion is true.** - **Reason is true.** - **Reason does not explain the assertion.** Thus, the correct option is: **Both assertion and reason are true, but reason is not a correct explanation of assertion.** ---
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