Which of the following gases is blown into the blast furnace to remove carbon and sulfur from "pig iron?"

Name: Which of the following gases is blown into the blast furnace to remove carbon and sulfur from "pig iron?"
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Question

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Oxygen is blown into the blast furnace to remove carbon and sulfur from pig iron in a process called oxidation. This process creates carbon dioxide and sulfur dioxide which are then released from the furnace.

Which of the Following Gases Is Blown into the Blast