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JEE Main levelSingle correct optionDifficulty 2 of 3mt080

Which statement about slag in the blast furnace is correct?

  1. AIt is gaseous and leaves with the waste gases
  2. BIt is less dense than molten iron, floats on it and shields it from oxidation by the blast
  3. CIt is denser than molten iron and collects at the bottom of the furnace
  4. DIt is a solid alloy of iron and carbon that is tapped from the bottom

Answer: B

Molten slag has a lower density than molten iron. It therefore forms a separate layer above the metal, protects it from the air and is tapped separately.
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