How is limestone used in Fe extraction :
Correct answer: C. Formation of slag
- A. Oxidation of Fe ore
- B. Reduction of Fe ore
- C. Formation of slag
- D. Purification of Fe formed
Explanation
Limestone is used in the formation of slag during the extraction of iron from its ore in a blast furnace. The blast furnace process involves heating iron ore (typically hematite or magnetite) along with coke (a form of carbon) and fluxes like limestone. Limestone acts as a flux by combining with impurities in the ore, such as silica (SiO2), to form a slag. The slag floats on top of the molten iron and is easily separated, carrying away the impurities. This helps in the purification of iron.Options A and B are incorrect because limestone is not involved in the oxidation or reduction of iron ore. Option D is incorrect because limestone does not directly purify the iron formed. It is primarily used in the formation of slag to remove impurities.
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