Pure instead of air is used to oxidise pig iron because
CHEMISTRY · Single correct · CBSE · Chemistry · Metals and Non-metals · Metals and Non-metals
Problem
Pure O2 instead of air is used to oxidise pig iron because
(1) Molten metal takes up a small amount of nitrogen, which makes the steel brittle.
(2) Air is not as efficient at oxidising all impurities to their respective oxides.
(3) Air contains moisture and will precipitate iron as Fe2O3.
(4) Iron reacts with air to form FeCO3.