Question:
Which of the following statements is correct regarding the slag obtained during the extraction of iron?
Which of the following statements is correct regarding the slag obtained during the extraction of iron?
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Slag formation: \(CaO + SiO_2 \rightarrow CaSiO_3\). This removes the impurity silica and protects the molten metal from oxidation.
Updated On: May 2, 2026
- The slag is lighter and has lower melting point than the metal.
- The slag is lighter and has higher melting point than the metal.
- The slag is heavier and has lower melting point than metal.
- The slag is heavier and has higher melting point than the metal.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
In the blast furnace extraction of iron, slag is formed by the reaction of flux (limestone) with impurities (silica).
Step 2: Detailed Explanation:
The slag formed is calcium silicate (\(CaSiO_3\)). It has a lower density than molten iron, so it floats on top of the molten iron, allowing easy separation. It also has a lower melting point than iron, ensuring it remains molten and can be tapped off separately.
Step 3: Final Answer:
The correct statement is that the slag is lighter and has a lower melting point than the metal, option (A).
In the blast furnace extraction of iron, slag is formed by the reaction of flux (limestone) with impurities (silica).
Step 2: Detailed Explanation:
The slag formed is calcium silicate (\(CaSiO_3\)). It has a lower density than molten iron, so it floats on top of the molten iron, allowing easy separation. It also has a lower melting point than iron, ensuring it remains molten and can be tapped off separately.
Step 3: Final Answer:
The correct statement is that the slag is lighter and has a lower melting point than the metal, option (A).
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