JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt159
Which statements about the blast furnace extraction of iron are correct?
Apig iron tapped from the furnace contains about 4% carbon along with small amounts of S, P, Si and Mn
Bthe molten slag is denser than molten iron and therefore collects below it
Ccoke serves as a fuel and, through C+COX22CO, as the source of the reducing gas
Dlimestone decomposes to CaO and COX2, and CaO fluxes silica into CaSiOX3 slag
Answer: A, C, D
Coke burns for heat and generates CO with COX2, limestone supplies the flux, and pig iron has about 4% carbon with other impurities. The slag is less dense than iron and floats on it, so the last statement is wrong.