(A) If air is used for the oxidation of pig iron,the molten metal will take up a small amount of nitrogen from the air. This nitrogen makes the steel

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Molten metal takes up a small amount of nitrogen which makes the steel brittle

(A) If air is used for the oxidation of pig iron,the molten metal will take up a small amount of nitrogen from the air. This nitrogen makes the steel brittle. Hence,pure $O_2$ is used instead of air to avoid the presence of nitrogen.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

Medium

Pure $O_2$ instead of air is used to oxidise the pig iron because

A
Molten metal takes up a small amount of nitrogen which makes the steel brittle
B
Air is not as efficient to oxidise all the impurities to their respective oxides
C
Air contains moisture and will precipitate iron as $Fe_2O_3$
D
Iron reacts with air to form $FeCO_3$