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  4. In the manufacture of iron from haematite, limestone is added to act as :

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Q. In the manufacture of iron from haematite, limestone is added to act as :

BITSATBITSAT 2010

Solution:

The flux used in the extraction of iron from haematite in the blast furnace is a basic flux, lime stone $\left( CaCO _{3}\right) \cdot Ca _{3}\left( PO _{4}\right)_{2}$ present in lime stone reacts with $SiO _{2}$ to produce slag.