1.

Pure O_(2) instead of air is used to oxidise the pig iron because:

Answer»

MOLTEN metal took up small amount of nitrogen which makes the steel brittle
Air is not as efficient to OXIDISE all the impurities to their respective oxides
Air contains moisture and will precipitate iron as `Fe_(2)O_(3)`
Iron reacts with air to `FeCO_(3)`

ANSWER :A


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