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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt216

Which statements about iron extraction in the blast furnace are correct?

  1. AThe slag is less dense than molten iron, so it floats and is tapped separately
  2. BCoke is converted to CO by , an endothermic reaction favoured at high temperature
  3. CSilica gangue is basic, so an acidic flux is needed to remove it
  4. DLimestone provides CaO, a basic flux that combines with acidic gangue to form slag

Answer: A, B, D

The Boudouard reaction is endothermic with . gives CaO, which reacts with : . The slag floats on iron. Silica is acidic and needs a basic flux, so the last statement is wrong.
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