why pig iron (iron obtained from blast furnace) have a lower melting point compared to 1538 degree centigrade?
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The iron obtained from Blast furnace contains about 4% carbon and many impurities in the smaller amount (e.g., S, P, Si, Mn). This is known as pig iron. It can be moulded into variety of shapes.
Cast iron is different from pig iron and is made by melting pig iron with scrap iron and coke using hot air blast. It has slightly lower carbon content (about 3%) and is extremely hard and brittle.
Hence, option B is the correct answer.
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