During the extraction of iron in a blast furnace, silica (SiO2) is present as an acidic gangue. Which of the following substances is added as a flux, and what is the chemical formula of the slag formed?

Options:

• A: Calcium carbonate (CaCO3) is added as a flux, and the slag is Calcium silicate (CaSiO3).
• B: Iron oxide (FeO) is added as a flux, and the slag is Iron silicate (FeSiO3).
• C: Alumina (Al2O3) is added as a flux, and the slag is Aluminum silicate (Al2(SiO3)3).
• D: Coke is added as a flux, and the slag is Carbon silicate (CSiO3).

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