In the extraction of iron, carbon monoxide acts as O A catalyst OB an inert gas . an oxidising agent . a reducing agent .

a reducing agent .

Explanation:

In the extraction of iron, carbon monoxide acts as the main reducing agent.

Carbon monoxide is a neutral, colorless and odorless gas. One of the property of carbon monoxide is that it is a powerful reducing agent as it combines with oxygen readily to form CO₂ and hence its use in metallurgy.

So, carbon monoxide acts as the main reducing agent.

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