Wrought iron is the purest form of iron. Write a reation used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron?

Options

A. carbon which reduces the impurities
B. water which dissolves the impurities
C. limestone which changes impurities into oxides and pass into slag on heating
D. Iron oxide which reacts with impurities on heating by forming slag

Answer

C

Explanation

`CaCO_(3)` is used as basic flux, `SiO_(3) P_(2)O_(5)` are acidic