Medium
Pure $O_2$ instead of air is used to oxidise the pig iron because
- AMolten metal takes up a small amount of nitrogen which makes the steel brittle
- BAir is not as efficient to oxidise all the impurities to their respective oxides
- CAir contains moisture and will precipitate iron as $Fe_2O_3$
- DIron reacts with air to form $FeCO_3$
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